Desparatly need advice with ongoing problems with RD532 combi boiler

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Hi

I've been having issues for some months with our RD532 boiler. 2 different engineers have been unsuccessful in diagnosing the fault.
Here's what happens. When a hot tap is turned on the boiler fires up but very quickly over heats. The temperature gauge on the front the shoots straight up to 99 in the space of a few seconds (the temp selector on hot water dial is set at minimum). When you take the cover off you can see steam and bubbling escaping from the boiler core. The boiler will then shut itself off. The hot water will stay in the boiler for a few minutes and then with a bit of banging the hot water gets released into the radiators.
However this doesn't happen every singe time. It's all a bit random. Generally, once it over heats, I'll leave it for a few mins then try and again and 7/10 times it will give me steady hot water.
The first engineer to visit changed the diverter valve but this didn't help. The next one put a new heat exchanger on which also hasn't helped.
There must be a way to diagnose the fault without randomly changing parts until something works. The first guy wanted to try changing the electronics/mother board but wasn't sure if that's where the fault is...and at £400+ I don't want to try it unless it's going to work.
Any ideas please ? I could post a video of it if that helps.
Many thanks.
 
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Did they check the pump was running? That would be the most likely culprit...
 
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There must be a way to diagnose the fault without randomly changing parts until something works
There is, you need to get an engineer in who is familiar with fault diagnostics and not just guessers that will chuck parts at it.

Depending on what is found it may be worthwhile talking to Worcester and asking them about a fixed price repair.
 
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Yes but does it have sufficient performance to operate in DHW mode which places a much higher demand on it, and by the sound of the fault the pump could be sticking.
 
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Call Worcester for a fixed price repair and you will get a warranty with it
 
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Is it definitely the old rd532 or the newer 532i?, if the pump has 2 purple wires in addition to the 3 core feed then id definitely start there.
 

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