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- 12 Jan 2006
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HI,
Had plenty or problems with boiler to date. Boiler is Puma 80 and problem is that radiators are not getting hot but HW is fine. I have searched this forum and used my own tests to conclude that likely problem is vax capsule diverter valve. This is what occurs.
DHW is fine but it comes out very hot to start with, you could burn yourself almost.
When boiler in CH mode, it fires up and then flames go high then reduce as expected but after relatively short while they stop. Pump works all along. Under boiler CH pipes get warm (hot after while). It appears to me flow of CH water is restricted. I have warmed up diverter valve capsule with hot air gun. this improves the flow of hot water to radiators but after while the flow slows down.
I have today drained system, flushed it with cold mains, filled with system cleaner in case there are some particles blocking the valve seat.
Can diverter valve be taken apart and only vax capsule changed? if so any place one could get capsule in NW London ( around Park Royal NW10)
Is it worth changing capsule only? Can I test capsule to see if it works?
Is there any other explanation to problems with this Puma? Pump was changed about 2 years ago and since then flow was not best. Is it possible I have fitted the pump wrong way round the arrow on the pump body point upward toward the heat exchanger. There is bypass valve under boiler. Should this valve be closed to improve flow? anf if so by how much i.e. shut or half closed.
Sorry for to many questions.
Had plenty or problems with boiler to date. Boiler is Puma 80 and problem is that radiators are not getting hot but HW is fine. I have searched this forum and used my own tests to conclude that likely problem is vax capsule diverter valve. This is what occurs.
DHW is fine but it comes out very hot to start with, you could burn yourself almost.
When boiler in CH mode, it fires up and then flames go high then reduce as expected but after relatively short while they stop. Pump works all along. Under boiler CH pipes get warm (hot after while). It appears to me flow of CH water is restricted. I have warmed up diverter valve capsule with hot air gun. this improves the flow of hot water to radiators but after while the flow slows down.
I have today drained system, flushed it with cold mains, filled with system cleaner in case there are some particles blocking the valve seat.
Can diverter valve be taken apart and only vax capsule changed? if so any place one could get capsule in NW London ( around Park Royal NW10)
Is it worth changing capsule only? Can I test capsule to see if it works?
Is there any other explanation to problems with this Puma? Pump was changed about 2 years ago and since then flow was not best. Is it possible I have fitted the pump wrong way round the arrow on the pump body point upward toward the heat exchanger. There is bypass valve under boiler. Should this valve be closed to improve flow? anf if so by how much i.e. shut or half closed.
Sorry for to many questions.