5 things to try to fix your commercial boiler

Technician repairing an hot-water heater - Commercial boiler common fixes

Having heating or hot water problems with your commercial boiler? Here’s a few common fixes you can try before calling a Gas Safe registered engineer. Other than the ways listed below, it’s important you don’t try to fix your business boiler by yourself. It’s dangerous and may invalidate any warranty you have on your boiler.

Common fixes to try on your business boiler before you call us

1. Low pressure

If your boiler’s pressure gauge is showing a reading of one bar or less, low pressure could be the reason why your boiler is not working.

Topping up the pressure yourself is usually straightforward – follow the steps in your boiler’s manual or watch our video.

Commercial boilers can’t function properly if the pressure is too low. If this doesn’t fix then the problem may be caused by a leak in the system or through a faulty valve. You’ll need an engineer.

2. Frozen pipes

If it’s been very cold, the condensate pipe of your boiler can freeze. You may hear a gurgling sound when your boiler is running.

Try thawing your pipe outside with warm, not boiling water.

3. Boiler or thermostat settings

Your commercial boiler doesn’t come on when it should, or fires up unexpectedly, or you can see an error code on your boiler.

Check if you have a reset switch on the front of your boiler and hold it down. If your thermostat needs batteries, check if they need replacing.

4. Pilot light gone out

The pilot light or flame is orange / yellow in colour (it should be blue). You may hear banging, clanking or tapping.

If your system has a permanent pilot light, check it hasn’t gone out. If it has, then you’ll need to call an engineer.

There could be an issue with the gas supply to your boiler.

5. Boiler keeps locking out

You’ll see a red light or error code on the boiler control panel.

Try holding the reset button on the front of your boiler. If you have to reset it a lot, there may be a bigger problem and you’ll need to call an engineer.

If your commercial boiler still isn’t working…

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