My central heating system has been working fine until just recently when the pump has started banging and the boiler has started tripping. It has never done this before. When the heating is started up it works fine for about 40 mins and then the pump starts banging for about 3 mins and then it works as normal. After an hour or so the boiler will trip. I have bled all the radiators and it has not cured it. I had a look at the 2 air release valves near to the boiler and one has a red cap loosely fitted on it and the other red cap appears to be missing. Would this missing red cap stop some of the air being able to leave the system and this is leaving an airlock in the system that is causing the pump to bang and the boiler to trip ?
Central Heating Pump bangs every 30 mins and boiler trips
- Thread starter brickland04
- Start date
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I have an Ikon 60-80 CI FG.C No.41-047-29 Cat I 2H Fanned Flue Boiler from Travis Perkins and it was installed about 4 years ago.
Ok, I think that's not a combi (?) but I don't know if it's a sealed system or open vented. Any ideas?
In any case, first check that there is enough water in the system - pressure gauge or water level in feed tank. It might help if you could post a photo, but I think the air vent caps don't matter, as long as they're not screwed down tight.
In any case, first check that there is enough water in the system - pressure gauge or water level in feed tank. It might help if you could post a photo, but I think the air vent caps don't matter, as long as they're not screwed down tight.
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It's not a combi and I think that it is a vented system as there is a small tank in the loft next to the main water tank. I checked this at the weekend to see if the ballcock was stuck or there was no water in it. There was water in the tank and I dipped the ballcock down and it filled with more water.
Have you got trv's on all rads if so take a head off of one to act as heat sink
Sounds like pump maybe faulty. Is boiler going out on high limit stat?
I have got TRVs on all radiators except the one near to the thermostat. Can you explain one you mean about using it as a heat sink ?
I am not sure what you mean by "high limit stat". Please can you explain
If I am to replace my pump and I currently have a Grundfos Selective UPS 15-50 Pump. I have seen a Grundfos alpha that automatically adjusts pump speed, but i don't know whether they are actually any good. The pumps are always quoted in either 5 or 6 meter head, but would it matter whether I got a 15-50 or 15-60 pump ?
The high limit stat is the overheat thermostat on the boiler. Is the boiler getting exceptionally hot ie if pump was faulty or not large enough then the heat would not distribute from the boiler and thus you would get knocking sounds until eventually the overheat stat would trip
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