Search results

The Transformer goes into a thermostat which switches the output of the transformer on and off to the gas valve. Problem is boiler does not work when GV is buzzing. When the GV is buzzing it does not open and so the boiler does not heat. It's was a very cold Christmas. Graham.

I've had the voltages measured on the input and output of the transformer when the GV is buzzing. The voltages where correct. We've decided to replace the boiler. We are now coming up to our 5th week without heat and starting to wonder what will fail next on a 27 year old boiler even if we...

I just released I'm probably not measuring the transformer output when it is connected to the GV correctly. My RGI should be back tomorrow so I will get him to do this and report back. Graham.

The output of the transformer does not change between buzzing and non buzzing. So I guess it must be something to do with the thermostat, gv or wiring between them. Graham.

I do not know why it has a SIT GV fitted. This was done a couple of years ago. Graham.

I will try and get these done tomorrow. I need to take a look at the circuit diagrams. Graham.

I have/will not been. He has been excellent in the past. He is a bit stumped on this one though. Graham.

[/url] Do you mean check the voltage at the Transformers output pins or when it is in circuit with the thermostat? When it is in circuit with the thermostat it is at 37V and drops to 22V connected to the gas valve. I have not measured the output of the Transformer when it is not connected...

Have only checked the voltages going to the coil connected to the gas valve. Have not checked the the mains connected to the transformer or voltage from the transformer to the thermostat. I thought that if the two cables to the coil where receiving ~37V everything else would be OK. Could...

Hi All, First post. We have had new radiators fitted which did not appear to be getting as hot as expected. So a new thermostat was fitted to the boiler. Boiler worked correctly for ~ 13 hours and then started to buzz. Buzz was diagnosed as faulty gas valve. The gas valve has been...