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We have a vaillant combi boiler, with a VTR360F time switch, what symbols should be illustrated on the display to have the heating on timer.

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Posted on Jan 02, 2017

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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

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SOURCE: I have a vitodens 100-w

new diverter valve

Posted on Nov 25, 2008

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SOURCE: my vaillant boiler is displaying

Have you topped the system up with water? The pressure gauge should be showing an operating pressure of 1.5 Bar in the green section.

Posted on Jan 13, 2009

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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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SOURCE: f20 error on vaillant eco28

F20 is a flow sensor error. Can be due to a defective sensor/ not correctly fitted, or you may have poor circulation, a big difference in flow and return temperatures, can sometimes make the boiler think it has a defective sensor, check good circulation through system, or if you have thermostatic radaiators valves on every single radiator, take 1 head off, as if you dont have a bypass fitted, it needs a radiator as a bypass circuit

Posted on Mar 03, 2009

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