PostHeaderIcon Which part is faulty on my Worcester 35cdi boiler?


I have two mixer showers in house fed from worcester 35cdi boiler.They have both worked fine for 8 years.
Recently they both suffer from the same problem.The water heats fine for approx 2 mins then boiler goes off and within 15 secs boiler fires up ,this repeats continually.

However when hot water taps are run for bath ,sink etc the boiler heats the water ok and does not go off.
Can anyone give me any help on which part may be at fault with my boiler ?

If the boiler works fine when running hot water its more likely to be the showers that are the problem. Chech the shower heads are not being obstructed by scale or debris as what is probably happening is there is insufficient flow through the heads and the boiler is going to shut down either on its thermostat or overheat cut off. It is possible that either of those components could be faulty but I would check the showers first.

One Response to “Which part is faulty on my Worcester 35cdi boiler?”

  • pipe strangler says:

    If the boiler works fine when running hot water its more likely to be the showers that are the problem. Chech the shower heads are not being obstructed by scale or debris as what is probably happening is there is insufficient flow through the heads and the boiler is going to shut down either on its thermostat or overheat cut off. It is possible that either of those components could be faulty but I would check the showers first.
    References :

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