Hi,
1st time poster on here and looking for a bit of guidance.
The hot water side of our boiler is not firing up at all, but the central heating side works ok.
Having replaced the hot water tap flow sensor with a new one. I've come to the conclusion that the problem is somewhere on the boilers PCB.
I've removed the PCB from the boiler and had a very close look at with a magnifying glass, but I can't see any dry joints, burnt out components or broken tracks.
A new PCB board will cost me £150, so I am very keen to try to fix it myself and hopefully learn something along the way.
I know a tiny bit about electronics, so I am guessing that the most likely components to fail on this PCB would 1 or more of the 6 miniature power relays. Simply because I know relays have moving parts in them. Does this sound plausible?
The 6 relays are all the same, and have V23061-A1005-A302 written on them.
I've found a datasheet for them here
http://www.mouser.com/ds/2/418/NG_DS_MSR_0611-110552.pdfThe datasheet says they are MSR relays, but I have no idea what MSR actually stands for, and the datasheet doesn't say either.
I am fine with de-soldering them from the PCB with my soldering iron and a bit of braid, but I am stuck with how to actually test them.
They are rated as 12 volts. So I guess this means that if 12 volts is applied across pins A1 and A2 it closes the circuit on pins 11 and 14?
I have a multi-meter, a breadboard and a few resistors (from when I dabbled with learning electronics many years ago). I want to build a simple circuit on the bread board that will test each relay 1 at a time, but I haven't got a clue where to start really or is there another much simpler way to test them without building a circuit? From reading the datasheet, I'm guessing the first test I should do is check that there is 652 ohms of resistance across pins A1 and A2.
Thanks in advance.