Hello,
I wonder if you could help with a problem I have with my combi Boiler.
The make and Model is a Vokera Flowmatic 20/80 RS. The problem seems to center around the burners not activating. I have followed the fault diagnosis and can't come to a conclusion on the faulty part.
If I set the Central Heating Thermostat to the lowest setting and switch it to constant, the pump activates and all the micro switches click into place, but the burners don't come on.
I have checked the voltage on the terminals of the Modulator coil and it reports between 1.5 volts and 2. If I move the pink wire from connection 1 to 1A on the Central Hating thermostat it still doesn't fire the burners up and I get a voltage of between 12.5 and 13. This seems correct according to the manual
I have removed the Modulator Coil and tested the Ohms resistance. It reports 46 Ohms. Which I think is ok. The manual says 50.
If I turn the heating on the burners will turn on to High Fire eventually but just for a short period of time then go out completely, but the pump still works. Its as if it tries to switch to low fire but can't hold it.
The similar symptoms happen when turning on the Domestic Hot Water, so I don't think it is the thermostats as they are separate.
I was thinking it could be the Modulator Coil or the Gas Valve solenoid or PCB.
Sometimes it will work fine and the burners seem to stay on as normal, When it does the radiators get hot.
Any help or advice would be appreciated.
Thanks in advance
Dave
I wonder if you could help with a problem I have with my combi Boiler.
The make and Model is a Vokera Flowmatic 20/80 RS. The problem seems to center around the burners not activating. I have followed the fault diagnosis and can't come to a conclusion on the faulty part.
If I set the Central Heating Thermostat to the lowest setting and switch it to constant, the pump activates and all the micro switches click into place, but the burners don't come on.
I have checked the voltage on the terminals of the Modulator coil and it reports between 1.5 volts and 2. If I move the pink wire from connection 1 to 1A on the Central Hating thermostat it still doesn't fire the burners up and I get a voltage of between 12.5 and 13. This seems correct according to the manual
I have removed the Modulator Coil and tested the Ohms resistance. It reports 46 Ohms. Which I think is ok. The manual says 50.
If I turn the heating on the burners will turn on to High Fire eventually but just for a short period of time then go out completely, but the pump still works. Its as if it tries to switch to low fire but can't hold it.
The similar symptoms happen when turning on the Domestic Hot Water, so I don't think it is the thermostats as they are separate.
I was thinking it could be the Modulator Coil or the Gas Valve solenoid or PCB.
Sometimes it will work fine and the burners seem to stay on as normal, When it does the radiators get hot.
Any help or advice would be appreciated.
Thanks in advance
Dave