Biasi m90 24s

[peterno]

Hello all

I have a problem with my biasi boiler,

I tried to wire my new thermostat to boiler but the thing is that when i turn on c.h the first two lights flas on my boiler(thermostat is off) and the furnace is heating anyway. when i turn thermostat on the normal procedure happens the first and third light are flashing.

I also tried the boiler without thermostat: with the m link between 1-3 in the boiler is working correctly. if i remowe the link again the first two lights green and red are flashing together and the boiler doesnt shut off.

any ideas?

 

[peterno]

anyone?

 

[Agile]

First two lights flashing indicate operation of the frost stat circuit!

Have you mistakenly applied mains voltage to any of those 1-3 connections?

Or applied a mains neutral to any of them?

What model is your stat?

Tony

 

[peterno]

actualy I may have accidently put neutral on thermo when wiring it

 

[Agile]

Applying any external connection to either of those two terminals may have damaged the PCB in the boiler.

An expensive DIY job there. Better to have a professional do it for you!

They must be strictly a two wire volt free circuit.

Tony

 

[peterno]

ok thanks I'll rather call a professionall

 

[peterno]

As i see you are a professional, is it possible to fix pcb or should I just order a new one?

 

[Agile]

I don't know if you have damaged the PCB.

As an electronics engineer I can repair PCBs if I wanted to but most would replace a damaged one with a new one!

Tony

 

[Abcplumb]

Those biasi pcb's are too expensive.
There is a company in wembley that repairs pcb's and gives a years warranty.
You send them the faulty one and they send you a reconditioned one.

 

[Terry lambert]

CET Watford