When repairing underfloor radiant heating systems it is important to distinguish between electric and hydronic radiant heat systems.
This is because hydroponic underfloor heating has the potential to suffer from many more types of issues or failures than radiant electric underfloor heating.
Common Problems With Underfloor Heating
Hydronic underfloor heating uses a system of pipes fitted under the floor to circulate hot water that functions in much the same way as a traditional central heating system with radiators powered by a boiler or furnace.
As such, they are prone to suffer from many of the same sorts of problems that can occur with those more common central heating systems. This can include issues such as
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Trapped Air
The most common issue with hydronic or “wet” underfloor heating systems is trapped air in the pipes. Even with a constant flow of water, air can make its way into the piping which can reduce or prevent the flow of water entirely.
To resolve issues with trapped air you should bleed the pipes just as you would with normal radiators.
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Blocked Pipes
Similarly, it is not uncommon over time for particulates of dirt, scum, and other detritus to build up in your pipes just as they can in normal central heating systems. Just like trapped air, these blockages can reduce water pressure resulting in a reduction in heat throughout the entire system.
The best way to clear blocked pipes is to have the system power-flushed by a professional HVAC technician.
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Leaks
Unfortunately, leaks are not uncommon with hydronic underfloor heating. Even more regrettably leaking pipes in underfloor heating have the potential to cause massive damage to your home.
If you leak the pipework of your traditional central heating or radiators the biggest issue you are likely to face is that the heating will no longer be able to reach your target temperatures.
Suppose you suffer from leaks in your hydronic underfloor heating pipework. In that case, it can cause extensive damage to your floors and ceilings (underfloor heating in bathrooms, for instance) and potentially ruin them completely.
If you suspect you have leaking pipes you should call out a service technician from the manufacturer or other qualified HVAC technicians.
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Screed
The screed can compress and narrow the pipes if it was laid when the pipes weren’t fully pressurized. If this is the case, the pipes will never be able to reach optimal water pressure levels which will prevent rooms from being able to reach target temperatures.
