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by carlosg
Mon Nov 19, 2007 11:28 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Valliant Combi VCW Sine 18 T3 overheating
Replies: 3
Views: 3912

Hi Guys thanks for the replies. The boiler works fine with HW & CW only issue is occasionally it trips & requires a manual reset. I've noticed it trips out more often when its a very cold morning/night. My room stat (newly fitted) is right next to the front door/hall way & the hallway is...
by carlosg
Sun Sep 16, 2007 12:49 am
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic:
Replies: -1
Views:

Thermostat - which one?

I have an old Valliant Combi VCW Sine 18 T3 boiler and would like to change the old mechanical room thermostat. The manual states the stat model as a vrt378. I would love to upgrade to a modern digital stat if possible. I have checked the wiring of the old stat and there are 3 wires - yellow, red &a...
by carlosg
Wed Sep 12, 2007 6:32 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Valliant Combi VCW Sine 18 T3 overheating
Replies: 3
Views: 3912

Valliant Combi VCW Sine 18 T3 overheating

The boiler as the following problem hope an expert can help me. I turn the room thermostat to click (23degrees) & the boiler fires up. The temp dial on the boiler hovers around 60degrees for aprox 10Mins, flicking between hi/low flame. The flame then stays on high all the way from 60-88 degrees ...
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