Boiler: Camray 3 50/70
Burner: Riello 40 424T55 (OIL)
Programmer: Danfoss FP715
Valves (one each for Water & Heat): Danfoss HPA2
Pump: Grundfoss UPS 15-60
Hot water tank thermostat: Danfoss AT
Room thermostat: Danfoss (No model No. visible)
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Black smoke was issuing from the central heating boiler flue so last weekend I thought I would put it right.
A quick look showed that here was a wasps next in the boiler casing and over the winter it had decayed and fallen over the balanced flue airway, almost completely blocking it.
I removed the nest and whilst at it I swept the flue and removed the internal boiler plates and cleaning out all the gunge. The burner nozzle was thick with oily grunge as was the flame sensor so I replaced them both with new ones (of the correct type and size).
Everything fired up and worked ok and the programmer turned itself 'off' that night. In the morning I noticed that the pump was still running and the boiler very hot. It appeared to be working without the programmer and switching off on its internal thermostat. Tweaking the boiler temperature control would turn it burner off and on.
I tried various combinations of switching the programmer on and off but to no avail. I then removed the programmer from its base plate completely and still the boiler and pump were running.
The oddest thing is that if I leave it alone for some hours then go back to the programmer and turn it on for a few minutes then off everything goes off ok!
NOTE: When the programmer is 'OFF' the boiler runs but only heats the water.
So what the heck have I done - or is it a co-incidence and another fault has developed?!
Burner: Riello 40 424T55 (OIL)
Programmer: Danfoss FP715
Valves (one each for Water & Heat): Danfoss HPA2
Pump: Grundfoss UPS 15-60
Hot water tank thermostat: Danfoss AT
Room thermostat: Danfoss (No model No. visible)
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Black smoke was issuing from the central heating boiler flue so last weekend I thought I would put it right.
A quick look showed that here was a wasps next in the boiler casing and over the winter it had decayed and fallen over the balanced flue airway, almost completely blocking it.
I removed the nest and whilst at it I swept the flue and removed the internal boiler plates and cleaning out all the gunge. The burner nozzle was thick with oily grunge as was the flame sensor so I replaced them both with new ones (of the correct type and size).
Everything fired up and worked ok and the programmer turned itself 'off' that night. In the morning I noticed that the pump was still running and the boiler very hot. It appeared to be working without the programmer and switching off on its internal thermostat. Tweaking the boiler temperature control would turn it burner off and on.
I tried various combinations of switching the programmer on and off but to no avail. I then removed the programmer from its base plate completely and still the boiler and pump were running.
The oddest thing is that if I leave it alone for some hours then go back to the programmer and turn it on for a few minutes then off everything goes off ok!
NOTE: When the programmer is 'OFF' the boiler runs but only heats the water.
So what the heck have I done - or is it a co-incidence and another fault has developed?!