Hi
I have a 418 heat only boiler, external 3 way valve and running Y plan. No air in system and running Fernox F1 since new. Also magnetron on return next to boiler, hardly any deposit when checked every 6 mths.No ambiant temperature controls fitted. All Y plan valve working correctly and pump running fine and also bled.
On firing the CH with room stat well up up the boiler fires fine on what sounds like full power for about 1 min, I can see the temp rising to approx 45 deg. It then cuts down but is still burning but VERY slowly (can see gas meter moving). It stays like this for approx 6- 7 mins before firing on full briefly for less than 30 secs when it goes to about 53. It continues like this and the rads do eventually get hot but it can take nearly an hour. I think this is like a slow start. D.0 is set to 70, D.2 is set at 14, When it initially starts up the flow temp goes to 32 ish and the return is approx 23...both change gradually. I have looked on forum but nothing obvious on how to reduce this slow startup. I can see that D7 is possibly associated with this..its set at 53. Think it was like this last year but as working not a major issue but now retired. Any help please on what may need checking/adjusting
I have a 418 heat only boiler, external 3 way valve and running Y plan. No air in system and running Fernox F1 since new. Also magnetron on return next to boiler, hardly any deposit when checked every 6 mths.No ambiant temperature controls fitted. All Y plan valve working correctly and pump running fine and also bled.
On firing the CH with room stat well up up the boiler fires fine on what sounds like full power for about 1 min, I can see the temp rising to approx 45 deg. It then cuts down but is still burning but VERY slowly (can see gas meter moving). It stays like this for approx 6- 7 mins before firing on full briefly for less than 30 secs when it goes to about 53. It continues like this and the rads do eventually get hot but it can take nearly an hour. I think this is like a slow start. D.0 is set to 70, D.2 is set at 14, When it initially starts up the flow temp goes to 32 ish and the return is approx 23...both change gradually. I have looked on forum but nothing obvious on how to reduce this slow startup. I can see that D7 is possibly associated with this..its set at 53. Think it was like this last year but as working not a major issue but now retired. Any help please on what may need checking/adjusting