Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: vaillant boiler - no power
There are a number of protection devices in these boilers, but you should have a serviceman take a lokk at it - this will be heaps cheaper than if you blow it up
Posted on Jul 10, 2008
SOURCE: Vaillant Ecotec combi boiler -
The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.
What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.
A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.
Posted on Oct 07, 2008
First, find the wiring diagram and a voltmeter. Attach one lead of the meter to a good ground. Then trace the voltage as laid out on the diagram. For example, if you have voltage to a switch or device, but no voltage out, then that device may be defective. Check all connections. Your boiler has "self diagnostics" but with no display a simple power problem is indicated. If you have no wiring diagram check with the manufacturer online.
Posted on Nov 16, 2008
SOURCE: hi,i have a vaillant turbomax
I had this. Open up the main case, take the second inner case front off to expose the boiler.
Clean the thermocouple which detects the flame being lit with some steel wool held with needle nose pliers. It will be all sooty and will turn off the gas as a safety precaution if it does not detect heat fast enough.
Don't listen to the gas man who will say "needs a new circuit board mate" as this is usually a stock response.
Posted on Jan 05, 2009
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
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