hot water ok, No Central Heating


Postby brass_monkey » Mon Oct 29, 2007 5:12 pm

Indirect system
when selecting hot water only, boiler fires up ok.
Selecting Central Heating only - system dead.
Selecting Hot water and Central Heating system heats water only,
switch off Hot water, system dies.
Replaced Controller, room stat ok.
Any ideas?
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Postby marrtin » Tue Oct 30, 2007 9:00 am

Do you have a two or three port zone valve? Try operating it manually when the boiler is on. It could be stuck or faulty.
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Postby marrtin » Tue Oct 30, 2007 9:06 am

Do you have a two or three port zone valve? Try operating it manually when the boiler is on. It could be stuck or faulty.
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