Hi, my name is ***** ***** I have been in the home improvement and repair field for 20 years. I will be very glad to help you today. I would first check that there is not any debris stuck in the flow sensor and if the flow sensor tests out alright then the thermistor should be tested for continuity. If the thermistor tests fine then inspect the expansion tank diaphragm. If diaphragm tests well then failed PCB again.
ok thank you ... my email address is *****@******.*** i once used this site before so it keeps saying my email address is already registered but dont know why it wont accept it again today when i asked you a question... i am not a rich man very poor in fact is the thermistor the over run therministat ???
The thermistor is the temperature sensor. Not so sure about the email part. I only answer the questions but I can forward to our moderators after I have answered any further questions that you have if you like?
hello again ... sorry to sound thick .. is it like a rod that that goes into the boiler with a some sort of cable/lead that goes to a electric box that sits inside the boiler ??
am just trying to understand how my boiler works :)
It looks something like this
The thermistor senses the temperature
oh because my neighbour says my problem is the over run thermostat has failed and i looked that up for pics.. but my neighbour is no engineer at all..
The over run thermostat is working fine since it is firing when it should not and then the over run thermostat is activated and then going into lockout. That is the one thing we know for sure is working great.
sorry about this i dont understand the last answer .. "working fine since it is firing when it should not"
ok sorry i understand the answer now.. i had to read again
i personally think its the pcb board again, if i replace and still have the problem then i will have a spare.. i am no engineer but am sure i can change myself as it looks easy enough.. is it ok to change myself ?? would you say ?? if that does not cure it.. then i will call out you an engineer.. wopuld this be an ok plan?
I think it is an excellent plan. I actually agree with you that the board is the most likely. If you remove it and inspect the back of it you may even find scorch marks on it.
i think its the pcb board as its heating up the rads (even though heating is switched off) when the hot tap is running.. and it makes clicking noises
Yes. a failing relay on the board is the most likely.
ok .. yes i agree .. in my heart i thought it would be.. i still have the old pcb board ( the original) so will take this to an outlet and say i want one of these !! its got all the codes on it.. but as its at home and i am at work.. i dont have them to hand.. not that it makes any difference !!
Excellent. Let me know if there is any more information I can offer. You can still comment or ask questions if something comes up even after positively rating my service. I am running out on a call right now and will certainly respond to anything when I get back. Should be no more than an hour or two.
ok.. not being a pc geek i dont know how to get back to you after i have rated you but you have my email address :) drop me a line next week and i will tell you how i got on .. thank you so much for this advice.