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Hi all, hoping someone can help me, I have a Worcester boiler, I’m not sure which model but its gone faulty, I’ve had this issue a few times but only after the boiler has been turned off. In the past -once switched back on, it has seemed to sort itself out within a few days and then works fine.

What it does - when heating is put on the rads get warm to hot, and the display will go to around 74, it then lingers for a bit but then counts up to 99 the says U1, U2, U3 upto U9 then after a while it will count backwards and go to maybe 40 on the display, then it repeats this cycle over and over again. House tends to stay cold because the radiators never get hot enough to heat the house. Then like I said, in the past it has done this for a couple of days and then seems to sort itself out.
Last week it did it again, we went away for a few days so switched the boiler off and got home to this issue, because it was so cold we called out an engineer, local company. They suspected it is the pump, he also said if fitting a new pump doesn’t solve the problem then it will need a new PCB because the faulty pump will have broken the PCB - but we wont know that until the new pump is fitted.

So we have paid £179 so far for a new pump, all worked fine for the first hour or so and surprise surprise its doing the same thing. Now I’m not sure what to make of his statement about the pump causing problems to the PCB, how would it? So this is my question, Has he fitted a new pump when it didn’t need one and all along it was the PCB? And I’m now paying for things that weren’t required...
Thanks for any advice
 
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I would suspect a pcb fault bud i have known a pump to take out a board but normally some water involved somewhere ? hard to say without seeing it . cheers kop
 
Intermittent faults can be a nightmare to find and costly to put right has you have found out replacing the pump, in this case you will be better to call out Worcester on a fixed price repair
 
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