Here, we'll go through the most frequent combi boiler issues and how to fix them.
The following are the five most common combi boiler issues:
1-Boiler pressure drop
2-Leaky radiator
3-No hot water despite the heating
4-The condensate line has become clogged or frozen.
5-Is the pilot light turned off?
1-Boiler pressure drop
A combi boiler's most typical pressure is 1.2 bar. The overall pressure should be between 1.0 and 1.5 bar.
The indication bar should be located somewhere in the green zone.
If the bar is around 0.5 or below, this is commonly an indication of a water leak. If it falls below 0.4, the boiler may freeze up and refuse to restart.
The combi heating system is overfilled if the indication bar is very high (as high as 2.75).
Low-Pressure Solution
Look for the filled loop (usually underneath the boiler). Anticlockwise turn the little tap. The pressure in the boiler should begin to rise. When the pressure hits 1.5 bar, turn the tap back clockwise.
A High-Pressure Solution
Bleed the radiators until they are back to normal pressure. If you find yourself needing to repressurize the boiler on a regular basis, call the contractor or hire an engineer.
2-Leaky radiator
Leaking radiators are another major problem with combi boilers.
If the boiler isn't leaking yet the heating isn't effective, a radiator leak might be the source of the problem. Corrosion, trash in the system, or loose connections are all possibilities.
Even the tiniest leak may cause a whole system to lose pressure, which is quite frequent with boilers.
Solution
It's not simple to find a leak but search for water under any radiator.
You may check for a leak by running your hands along with the radiator. Make sure your radiator valves are in good working order.
Tighten the connections as much as possible if you've noticed a leak. If this doesn't work, you'll have to enlist the help of a professional for emergency boiler repair.
3-No hot water despite the heating
This is an all-too-common combi boiler issue.
The main exchanger for a heating system is found in a combi boiler. Water is routed to a secondary exchanger when a hot water source (such as a tap) is turned on. A diverter valve is used to accomplish this. If this is the case, it might explain why the heating is on, but no hot water is available. Even though the thermostat shows the heating is on, your radiators may not be warming up.
This is most likely due to a diverter valve issue. Broken airlocks and a faulty diaphragm are two more possible causes.
Solution
First, double-check your thermostat. It might be flashing, indicating that the battery needs to be replaced.
You'll have to reset your heating times if you don't replace them within one minute.
The problem may generally be detected promptly by a gas-certified engineer. This is because they will be able to replace the part for you.
4-The condensate line has become clogged or frozen.
Most earlier combi units lack a condensate pipe, this only applies to newer ones.
The pipe's purpose is to transport wastewater.
However, with the cooler temperatures in the winter, it is possible for freezes to occur, resulting in jams.
You might not think this is a major problem with your combi boiler, but it might cause it to shut down.
Solution
Even if you are an experienced DIYer, attempting to repair the problem yourself might result in costly plumbing damage. Instead, find the condensate and try to thaw it out with a pot of hot water. After that, empty the condensate pipe beneath the boiler.
If this does not work, hire a boiler repair professional who can heat your pipes to dissolve any blockages.
5-Is the pilot light turned off?
This is something you should aim to get to as soon as possible.
This is because the pilot light is linked to the gas. There might be a carbon buildup that has obstructed the pilot light.
Otherwise, a draught might blow out the flame. This indicates an issue with the flue, as the wind is blowing out the flame.
It might also be a buildup of limescale or a damaged thermocouple.
Solution
Wait for the pilot to cool before removing anything that is obstructing the pilot hole with a needle.
If the thermocouple is blocked, this will assist the pilot flame in heating it. However, if you are unsure, we recommend having an expert look at it. It is unlikely to be costly, and it will provide you with a reliable assessment.
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