Posts Tagged ‘Faults’

Boiler FaultsCommon Heating Control Faults – Never Go Wrong Again!

Defects central heating for Y, and drawings of S.

A wide range of common defects that occur in heating systems, a little 'more about the specific components of other manufacturers. You will need an electricity meter test to perform these tests.

If the boiler has stopped completely, then check to see if the fuse unit. If there is power, then you should check whether the controls that link to the boiler is "on."

Make sure yourprogrammer is in the "on" position. Check that the boiler is sent a signal of "demand", called "power", the workload for brevity. If present, then the boiler must be switched on. If there is a light fault on the boiler check the manufacturer's instructions to see if anything obvious to check. After that, you should ask an engineer to provide gas to analyze the problem.

No signal from CMU to the boiler, then the fault of the control valves or thermostatscontrolling them.

For ‘S’ plan systems the 2 port brown wires should have demand for each function. If it doesn’t then the problem is most likely to be the thermostat. If there is demand on the 2 port valve but no output then most likely the 2 port valve is faulty and needs to be replaced.

For Y plan systems check that the 3 port valve has a live signal on the grey wire when Hot water is ‘off’. Then check that SWL goes live when you have hot water on and the cylinder thermostat requesting heat.

A common fault with 3 port valves is that the central heating comes on when the hot water only is selected and this is often because of incorrect wiring of the hot water off cable.

Boiler Faults