carter840 The inidciators on the front show that the right side light remains illuminated - is this the service boiler? Also you are correct that I couldn’t register continuity on the relay (that surprised me).
Can’t remember what lights that LED exactly
carter840 I’m short on time today, so I didn’t have a chance to switch SSRs as you recommended, but based on the above I’m inclined to order a new SSR for the service boiler.
I would continue with the plan as I advised, it’s all worked out for you so far, why change a good thing. My plan tells me whether the SSR is bad or the motherboard is bad…your modification is just a time delay and possibly it does the same with the replacement SSR (then money wasted).
carter840 To answer your question, yes my circuit is 20Amps - future proofing for whatever machine is next (hoping that’s not for a while with today’s economy)
It was as I expected, but you confirmed it…This means that breaker would have probably happily allowed 23amps to flow almost indefinitely.
carter840 Your suggestion of an in line fuse is sensible. There’s about 6-7 other fuses in the machine. Somewhat odd that there isn’t one for the mains. I might add a breaker right before the mains switch.
That would be an excellent idea…just remember, depending on type, breakers will sustain various increasing levels of overcurrent for decreasing amounts of time…so select carefully. They don’t reach their rating and immediately trip. Many fast blow fuses do of course!
Descaling is as per manual really….nothing changes, unless the boilers are physically out.