Heat Pump Heating issue with relay sticking

[CarolinaG]

I had a electrician look and apparently the relay is stuck so the pump keeps running even when not calling for hot water. We already replaced the Honeywell timer and that made no difference prior to calling electrician so its definitely a stuck relay. He said he couldnt get a replacement relay so that I would need a plumber. My question is, where is the relay, is it part of the pump or the electrical board or somewhere else? I dont want to get ripped off and so far everyone I've tried hasn't been able to fix it and never replied.

 

[brianmoooore]

If I were looking for the relay that controls the pump, I'd expect to find it on the circuit board, and probably soldered in place.
If it really is faulty, with no external cause, it wouldn't be difficult to replace by someone who knows how to use a soldering iron and with experience of repairing boards. The likes of CPC or RS Components can probably supply a suitable part, once you've identified it correctly.
A plumber would be way down the list of persons I would trust with the job. They would be more likely to replace the whole board at great cost.

 

[CarolinaG]

If I were looking for the relay that controls the pump, I'd expect to find it on the circuit board, and probably soldered in place.
If it really is faulty, with no external cause, it wouldn't be difficult to replace by someone who knows how to use a soldering iron and with experience of repairing boards. The likes of CPC or RS Components can probably supply a suitable part, once you've identified it correctly.
A plumber would be way down the list of persons I would trust with the job. They would be more likely to replace the whole board at great cost.

Thank you so much, that's what I thought after looking at the diagrams, so it made no sense why I would need a plumber! Is it possible to unstick a relay temporarily??

 

[brianmoooore]

Depends on the construction of the relay and what, exactly, has gone wrong with it. Some have a transparent cover on them, and the state of the contacts can be seen without dismantling.
If the cover of the relay, transparent or opaque, can be removed to expose the contacts, you might be able to unstick them if they have just lightly welded themselves together, or the mechanism might simply be broken.
It might even be a 'normally closed' relay, that has nothing wrong with it, and simply isn't being powered 'off' as a result of a fault elsewhere.