Underfloor Heating Repairs

UFH Specialists
Since 2004

Yorkshire Based
Family Firm

UFH Service

Specialist UFH
Repairs Service

Equipped to tackle any underfloor heating problem

As part of our service we use sophisticated thermal imaging equipment to help accurately pin point most problems and to enable us carry out the repair work in a timely and accurate fashion.

To give you an idea of some of the repairs we have undertaken; in these images we can clearly see half of the floor isn't warming up (in truth you wouldn't need a thermal image to tell you this!) This problem turned out to be an air-locked pipe.

Looking carefully at the following pictures we can see an unbalanced heating system, in this instance the flow rates needed adjustment.

Wiring Problems

The WarmFloors electricians often troubleshoot wiring problems in UFH installations. It's critical your wiring problems are dealt with by experienced UFH specialists.

  • Thermostat not working
  • Room controlled by wrong thermostat
  • Boiler not engaging

Air Locked Pipes

Air can sometimes get trapped in the UFH pipe network, reducing the effectiveness of your heating system. WarmFloors use top of the range thermal imaging to accurately diagnose air locked pipe problems.

  • Uneven heat transfer
  • Cold patches on floor
  • Half of the floor cold

Worn Out Pumps

The UFH water pumps can wear out over time, especially without regularly servicing. WarmFloors offer servicing agreements to prolong the life of your UFH parts including pumps.

  • Noisy pump
  • Overheating pump
  • Weak heating system

Ask an Underfloor Heating Specialist

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121 thoughts on “Underfloor Heating Repairs

  1. I have had to replace the automatic air vent valve on my downstairs manifold for the second time in just over 12 months. Is this a common issue with them or do I need to look for a bigger problem.

  2. We seem to be in the 1% of UFH cases where there is a leak under the tiles with dampness and stains on the floor. Our plumber has fixed a flow meter and automatic water filing device to our boiler, so I know that we are loosing 1dl per hour, that’s 1 litre every 10 hours. The boiler has been checked out and serviced, no problem there. Unfortunately, we have terracotta tiles so too thick for an infrared camera to really see what is happening. What alternatives are there to find such a leak with plastic underfloor pipes other than ripping up the entire floor? Fibre optic camera, tracer gas?

    1. My next step would be to carry out a pressure test on the underfloor heating using compressed air to confirm its actually leaking or not.

      All evidence seems to point to it – but ive had it before and it turned out be a unknown cold main below the insulation leaking.

  3. I have a 4 zone water system, zone 1 & 2 were fitted 1 year before 3 & 4. The 4 thermostats operate their respective zones when tested and all areas heat up correctly.
    The issue I have and have had for some time is; if I put zone 1 or 2 on they heat zone 1 & 2 correctly and no other zone. If I put zone 3 or 4 on they also heat zone 1 & 2 at the same time?
    I have had an electrician check all the wiring and it is fine, the actuators are also all in the up position.
    When 3 & 4 actuators & thermostats are calling for heat the lights are only on for the zones in question but zone 1 & 2 have no lights and the thermostas are not calling for heat but these zones also heat as well?
    I have an Heatmiser UH4 wiring box, Grundfos UPS2 pump, Watts 26LC Actuators.

    1. Sounds strange – but I would check the actuators are actually screwed on tight to the manifold and or the locking pins are removed.

      Some actuators have “easy fit pins” that allow the actuator to be locked open for easy fitting.

      Failing that it’s a wiring issue despite the electrician saying its ok.

  4. Hi – we live in an apartment block with communal hot water. Our apartment does not use radiators but instead underfloor heating. We have noticed that part of the apartment no longer seems to be heated underfloor and is very cold, whilst another part seems to be warm. We have multiple zones and the thermostats have been setup correctly. Not sure what to do, and worried that given its underfloor it will be hard to repair without ripping up the floor? Thanks

  5. Hi,

    When I put one of the zones thermostats on, we get the normal red light indicating demand on the thermostat but with seconds the valve and boiler light indicator on the main underfloor heating unit click on and off. quickly and then stays off never calling for the boiler or actuator valve to open again?
    Any ideas

  6. We have recently renovated the whole house and got UFH installed in the whole ground floor with 4 zones. Its always the case that one of the zone don’t heat up at all. Also mainly kitchen and open plan area is the one never heats up properly and its a big area. All other small areas heat up quite quick. I am always adjusting the flow meters. Sometimes when I only switch on the kitchen area then other areas start heating up. We have heatmiser thermostat for temperature control. Please help, its getting to a point where I get annoyed every cold morning. Thanks

    1. This is a hard one to diagnose over the email – but it could be any of the following plus something else:
      > Undersized primary flow and returns to the manifold
      > Actuators controlling wrong pipe circuits
      > Air in the system
      > lack of inhibitors causing debris in the system
      > block/faulty mixing valve
      > poor design
      > high heatloss
      > high thermal resistance of flooring materials

      Hope this helps.

  7. Hi, I have a ufh which was installed a few years back. It only worked well for a year. Since I’ve had many issues however the worst one that can’t seem to solved is that the ufh goes off after a few hours. I was told that the heat pump is going into alarm but the reason cannot be identified. The last attempt was to change the sensors and that didn’t work either. I was told my only option is to change the mother board. Would appreciate your comments. Thanks

    1. Im not expert on heat-pumps, but i fail to see how changing the “mother board” would help. it needs some investigation, my suspicion would be a lack of flow causing the heat-pump to “alarm” which in-turn will cause it to turn off. You need a proper heat-pump engineer to visit and maybe someone like us onsite at the same time.

  8. I have a wet Polypipe UFH in the kitchen with 2 zones (UFH and CH). I noticed certain parts of the UFH in the kitchen is cold. The manifold is working as expected and the flow and return pipes are hot and warm respectively. The flow meter is at max setting. What could be the cause of this issue?

    1. Hello – it could be many things, but these are a few ideas:

      > Air locked pipe
      > No pipe in cold area
      > pipe spacing too wide in cold area
      > Faulty flow meter
      > Faulty Pump
      > Restricted flow.

      Without been onsite its hard to diagnose.

  9. We have a similar problem to Eileen Crowe.
    This concerns a community building with a large activity room.
    The floor is designed and fitted by Rlefex Floors.
    Symptoms are
    – loss of water pressure.
    – one of the ’tiles’ making up the floor has lifted suggesting that water is involved.
    We have had the boiler thoroughly checked.
    Is it possible to put a sealant (eg FERNOX) into the water to overcome this problem?

    1. Hello

      We get this weekly about loss of water pressure and it rarely is the UFH system. The only way to be sure is to under take a pressure test using compressed air, this involves isolating the manifold, using the compressor to blow out the water, then test to 4 bar and see if it holds pressure. If it’s ok then my guess would be the boiler, expansion tank or a leak on the inter-connecting pipework to the manifold.

      Boiler engineers love to blame the underfloor heating as a reason for pressure dropping as it gets them off the hook because they can’t find the real reason.

      “one of the tiles lifting” yes it possible, but could be water from another source, or could be lifting for other reasons.

      No don’t put sealant into the UFH system, this isn’t a great idea, its like shutting the door after the horse has bolted.

      To recap – its possible you have a leak, but im all my time experience tells me its more likely to be on the supply side, rather than “in the floor”

  10. My gas boiler drops pressure very quickly when the underfloor heating is on .
    So we are assuming it’s a leak under the floor as when we turn the underfloor heating off the boiler keeps it pressure and works perfectly with the hot water and radiators upstairs
    I have had a local gas engineer in to have a look but he’s not confident with the underfloor heating

    1. Hi, its a very common enquiry is this for us, almost everyone thinks the underfloor heating pipes are leaking. Lets think about the underfloor heating pipes for a moment – the pipes are seamless from start to finish and unless someone has jointed the pipe or damaged it in anyway its 99.9% unlikley to spring a leak under its own accord, when compared to the normal plumbing in the house like the hot and cold feeds to the kitchen, bathroom, washing machine i bet there is over a 100 joints in the house alone and how many of those leak? very little.

      My guess if the boiler is loosing pressure when the UFH is on would be something like the expansion tank not big enough, under inflated for example, a weak pressure release valve on the boiler.

      The only way to guarantee its not the UFH pipes would be a pressure test using compressed air for the most reliable results, but we think its more likely to be boiler related.

    2. We have a 15 yr old system and certain zones aren’t working anymore. We have flushed all pipes and doesn’t seem to have fixed the problem possibly made other areas worse! We also have a few faulty actuators. We have a ground source heat pump. No one local seems to interested or knows what to do. Can you help?

  11. We have underfloor heating downstairs and in 1 bedroom upstairs. It was already installed when we moved here 8 years ago, we also have to add water to the boiler every month or so so possibly a leak somewhere. Would it be possible for you service our system please, we are near Stockport so not sure if you cover this area.

  12. Hi, I recently installed electric underfloor heating in the kitchen however it has never worked.

    The installer says they checked and all was working, I have since then had a electrician check it and he says there is no power flowing through the floor.

    I believe there may be a break in the cable.

    Is this something that you could possibly fix.

    Kind Regards

  13. I would be grateful if you could recommend a reliable and professional service engineer for my wet underfloor heating system.
    My postcode is BL8 4HL.

    We reside in a bungalow which we moved into 3 years ago and which has PolyPipe wet underfloor heating. This system was installed 12 months prior to us moving into our bungalow and has never been serviced within this 4 year period.

    To my knowledge the system has never been balanced or had an inhibitor added. In addition, the WUFH manifold has a slight leak coming from the large brass nut that the manifold is connected to.

    A ‘MagnaClean’ is installed within the system and the seven rooms in our bungalow have individual ‘Heatmiser’ thermostats.

    I trust the above information will assist you in your recommendation.
    Thank you.

  14. Hi my underfloor heating doesn’t seem to work in all the rooms it’s a water system and maybe benifit Fromm the thermal camera to see what up with the system could you please help to get it all working order it’s around 10years old

  15. I had a plumber block off my underfloor heating pipes (in my conservatory) as there was a leak at the control box. As I am planning to move in the near future I am wondering if the pipes can be re connected.

  16. I have a similar problem, one zone doesn’t heat up after several months turned down,[I was abroad]. When the thermostat was turned up, it just flashes and doesn’t activate the zone. The thermostat has been changed for one which I know works, but to no avail. Am I able to screw the grey actuator top off to reveal a pin, in the same way as with a radiator thermostatic valve? I assume that the pin is similarly beneath the plastic top, and covers a pin. It has been suggested that the pin could have stuck, having been out of action for a long time, and that a lubricant [silicone based] should free it, with gentle movement with pliers. Can someone please confirm that the actuator can be removed safely with the knurled wheel at it’s base. The system is by Nu heat, and the actuator is the latest model, grey coloured and OMDA-C. Your advice and observations would be appreciated . Thanks.

  17. Hi,
    We have recently moved in a house and the underfloor heating system is tripping the fuse when ever it is switched on.

    Could you please confirm if this is something you would be interested in looking into.

    Best Regards,

    1. Hi – It could be dependent on location – these types of issues are either really easy to find, or can require a couple of trips to site, so if your a long way away from us its best to use someone closer.

  18. hello, my name is clive,

    having problems with my new underfloor heating system, it is a poly pipe manifold with just 2 zones, this runs of a new worcester combi boiler,
    i also have central heating throughout the rest of the property, so this underfloor heating just serves the kitchen,
    system has to zone valves one for the rads and the other for the u/f,
    the problem is some times the boiler locks out to E9 which means limit sat on boiler or flow and returns crossed over?
    only does it when the u/f is on, installer came before christmas and re-purged the circuits of air, but now I’m not sure? pipe work gets very hot just before the blending valve, and does seem the flow & return are the right way round?

    thank you for taking the time to read this post,

    help much appreciated.

    1. Hi Clive – ask your plumber if you have an “automatic bypass valve” installed. If not ask them to install one, this will cure it.

    1. Hi – try checking the pins under the actuators are opening (popping up and not sticking down) If stuck down use some pliers and gently pull them up and free them off.

  19. Hello

    We have electric underfloor heating in 1 room which does not appear to be working.
    I am enquiring if you do repairs and if you can give me a quote for the repair?


    1. Hi – Sorry we dont repair electric UFH – type “electric underfloor heating repairs” into your search engine and there are a few firms that do.

  20. Would it be possible please for an engineer to come and check out our underfloor heating system for us please. This was installed before we moved into the house nine years ago. This heating system is on the ground floor beneath a stone floor in the kitchen and study area and hardwood flooring in the lounge areas. We have a separate underfloor heating system in the bedroom and radiators in other bedrooms. We would like this checking out because we don’t believe it is working efficiently.
    Thank you.

  21. System installed Nov.2012. Nu heat with 4 zones. Turned down whilst on holiday, but when returned kitchen zone fails to warm. Thermostat changed but to no effect. Actuator changed on manifold, but no effect. Thermostat attempts to connect, flashes red then green then off, at intervals. Red power light also switches on red, briefly, on circuit board. Plumber has spoken to Nu heat, but not been given any idea as to what to do next. Help please.

    1. Hi – im not 100% sure what those warning lights mean without been onsite, but im happy to take a look and we are sending you an email.

  22. Our electric underfloor heating has stopped working in the kitchen. The timer/thermometer switch is on and lit up and “clicks” when the temperature is raised or lowered but there is no effect on the system. There used to be a louder “click” from behind the fridge which might be the actuator? Are there 2 separate switches? Is this just a simple switch problem or a sign of a more serious problem.

    1. Hi – Sounds like the “contactor” behind the fridge could have failed – seek a local electrician to test it for you and also test the heating cables at the same time.

  23. Hello. Our liquid underfloor heating system is very temperamental. Some areas won’t heat up, some seems almost as if the manifolds may be connected to the wrong rooms. Rooms seem to be freezing or boiling. Can you help? We’ve had bad experience before with an underfloor service company who charged a fortune and made it worse, impacting on our boiler.

    1. Hi Chloe

      Sorry you have had a bad experience before, sadly its all too common these days. We can help you with this, and we can supply many references if you need reassurance.

      If we turn up and we think we cant help you we will simply explain the situation and wont charge for the visit, cant say fairer than that.

      Im sending you details via email.

  24. I can’t get my wirsbow underfloor heating (water based) going this year.
    I can’t remember how to turn it on.
    I’ve turned the thermostat up.
    Fiddled with the timer, but can’t get it to come on.
    Any help out there?

  25. Our under floor system, water based, was installed 8 years ago. It hasn’t been working for the last few months, the wall temperature control panel shows the ignition and the manifold makes a noise when you turn up the control but the floor does not get warm? It’s very cold in our kitchen since we have no other heat in there. Any ideas?

  26. I have a polypipe wet ufh system, I set controllers to comfort setting of 22 deg, but indicator doesn’t get over 19.7 ish. Fallback setting is 19, boiler temp is set to 47 deg as it only does ufh.
    Shall I turn up boiler temp?
    Or does system need bleeding?
    Boiler is 2 floors away from manifold

      1. Hi, I seem to have the same problem described by Adrian above. Cannot increase temperature on polypipe . It is freezing and getting very concerned. Can you help? Thanks

  27. I have moved into a house built a year ago and fitted with polypipe underfloor heating. There are four manifolds serving different parts of the house. There is no problem with the warmth of the floors in any of the rooms but intermittently, maybe twice a week, all the towel rails on the first floor get barely luke warm in the mornings. All towel rails have been bled. Other days they are all hot to the touch. Some days, the water in the showers is less hot than usual (and it’s not because of people using all the hot water before me) although fortunately I notice this less than the towel rail variability. The hot water is on 6 am to 10 pm. Is this indicative of a problem with the manifold or pipes on that floor?

    1. Hi Helen

      Hard to work this out without knowing more/seeing the set up.

      Do you have a separate timer for the towel rads? or are they connected to the manifolds?

      Because you mentioned the shower to be cooler on certain days makes me think its more to do with the boiler – Are these related events, do the rads go cool at the same time as the shower?