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British Gas replaced the heat exchanger as it was leaking. I have a glowworm swiftboiler. Now my heating is back working but not 100%. When I put the heating on I can see the flame (through the window in the boiler) go on for about ten seconds then switch off, go on then off etc. Some of the...

Any leaks/drips you know about should be repaired, pressure vessel may need checking to ensure it can take up any increase in pressure from heating the water in the system. the pipe outside will be connected to the PRV - this will also need checking/changing. the double check valve sounds like...

I cant understand this, now I have replaced the hose to the double check valve it is still leaking - it didn't before the guy removed it. Also, the pipe that goes outside is now leaking slightly onto the driveway (only slightly). Could it be the pressure vessel?

Water pressure needing topped up daily, pretty much going to zero overnight. Had British Gas out, they say nothing wrong with the boiler, must be a leak under the floorboards. Had another guy out who replaced the PRV as he thought that was the issue but problem still persists. Had another guy...