the heating stat on quattro gold turns boiler on but it keeps running swpt heating stat for dhw no change wont turn boiler off thanks

ray mac, February 2013

hi it could many issue which will need eliminating.
1. thermostat is stuck in the on position. will need to open and separate contact.
2. diverter valve in boiler faulty keeping heating microswitch in the on position. will need to check pin position is it retracting from the on position
3. faulty pcb

kash, February 2013