My boiler is controlled by a programmer unit to turn on and off at certain times. There is a receiver unit between the programmer and the boiler, and I believe this receiver unit is at fault.
The problem I see is that sometimes the boiler comes on at the correct time, but shortly after (sometimes seconds or minutes), switches back off again.
I have found that I can make the JQX-115F relay component switch on and off simply by moving the receiver unit from side to side. My understanding is that the relay should be switched by application of 24V DC.
So my question is, if the relay is switching as I move it, does that imply the relay is at fault, or could it be an input to the relay which is at fault?
(I ask because this receiver unit (Nobo RSX 512) has been discontinued, so I'm not sure I can get this repaired without changing the entire setup, or understanding and replacing the faulty component.)
Best Answer
From your comment, it seems most likely that one or more of the solder joints that connects the green terminal block on the right to the PCB is dry, cracked or is somehow otherwise failing. Strain on the PCB connections from the wires pulling on the terminal block is the likely cause.