Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Vaillant boiler (VCW GB 221)
The movement of the diverter valve is critical on this appliance, and is located on rear right of the boiler, when hot water is turned on, theres are two microswitches, which must break (they both close in Central heating mode), if pump is running, it is recognising the hot water demand, check microswitches are breaking, if not, it tends to be a defective servo valve (located above the water valve), or a blocked/ restricted control line (small copper tubes which connect into the servo valve)
Posted on Mar 03, 2009
If there is a hi-limit switch, maybe it's open, reset the switch, and monitor the temperature, if the temp. increases over the set temp. replace stat, and clean lime off from the tank, if does not have a filtering system
Posted on Apr 21, 2009
Go online to www.cheapboilers.com who deal with this type of boiler. It would be very difficult to troubleshoot this boiler with the information supplied. I hope this will be of some help to you.
They should also be able to get you a manual for your thermostat.
Posted on Oct 31, 2009
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