DIY Doctor UK DIY Forums

Posted: **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?

Posted: **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.

Posted: **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.

DIY Doctor UK DIY Forums

hot water ok, No Central Heating

hot water ok, No Central Heating