Hi there, my boiler occasionally won't fire up fully, by that i mean it will start, so get ignition and pilot light but it does not fully light. If I reach under and push the reset button really hard and keep my finger there for a few moments it fires immediately and stays on. But it sometimes can go out again, not fully, it leaves the pilot on and the pump running and if I press the reset it starts back up.
Looking at other similar problems on the site it seems as though my boiler may be overheating. But one curious thing is that if I give it an almighty thump where the thermostat control knob is it fires up! HR joint on the circuit board?
System (grundfos) pump runs okay with no undue noises at speed setting 3 and there appears to be no leak in the system. Cleaned and serviced 6 months ago.
Any help/advice much appreciated as dishwasher gone up the spout as well in solidarity!
Looking at other similar problems on the site it seems as though my boiler may be overheating. But one curious thing is that if I give it an almighty thump where the thermostat control knob is it fires up! HR joint on the circuit board?
System (grundfos) pump runs okay with no undue noises at speed setting 3 and there appears to be no leak in the system. Cleaned and serviced 6 months ago.
Any help/advice much appreciated as dishwasher gone up the spout as well in solidarity!
, pressing that reset is possibly guiding you into thinking you have an overheat , when it happens again tap underside of controls panel & the boiler will most likely fire , these boards are notorius for relay issues...............i'd like a pound for every installer who's replaced board , fan , PS , air tubes , restrictors , flue assembly.............& still the boiler won't fire 
