Grant Vortex Combi Oil boiler.

 

Fault is the boiler fires once radiators warm up, boiler shuts off then radiators go cold.  Go outside to boiler (it is an outdoor model) lights are normal indicating "demand" but no pump and no burner on.

 

Turn the thermostat knob on the boiler down then back up, boiler fires up again for one cycle then does not come back on unless you repeat with the thermostat knob.

 

Hot water functions still working normally.

 

On this one the thermostat knob drives a potentiometer on the one and only circuit board.  My guess it is probably one of the relays not working and I suspect the only cure is a new board.  If only I could find one.

 

Pictures including numbers:

 

 

 

 

 

Any idea where I might get one?

https://www.grantuk.com/professional/spares/oil-boilers/control-panel-spares/temperature-control-pcb-with-sensor-mpcbs54e/

 

looks like the pcbs56 doesn't have the sensor sockets but this does?

Think the temperature sensors use edge connectors on the PCB so no white plastic connector required on the PCB ??? 

 

This one also looks pretty similar but I cant see any matching numbers..

 

https://heatingpartswarehouse.co.uk/product/grant-temp-control-pcb-mpcbs96/?gclid=CjwKCAiAt9z-BRBCEiwA_bWv-BpM0mzS3DI_vjhm4RO_cSiHXdoWQBZ81HHJ1jwGZz9wPVopieemaxoCa30QAvD_BwE

 

Says..

"Suitable for the following boilers: Grant Combi V3, Grant Vortex Pro Condensing Combi (After Sept 08)"

It might also be possible to replace the relays if they have numbers on them.

Thanks.  Just a few moments ago I found one on ebay and ordered that one.

 

I don't want to get into a protracted fault finding saga, that would just take too long I fear.