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Mend Vaillant Home Heating Systems

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Vaillant timeswitch 150 analogue unit (clock stopped?

vaillant timeswitch 150 analogue unit. the clock has stopped working.
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Worcester boiler dripping water, can I just tight the screw? The icon next to the valve looks like radiators... [Read more]
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Following a F22 fault where we had no heating and only cold water from the hot water tap, I topped up the syst... [Read more]
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vaillant 837?

hi i have a 837 vaillant with the code s7. what can it be?

tony
January 2011
VaillantHeating, Home Heating Systems
'S' is a status code, basically telling you what the boiler is doing, S7 means the pump is running on after the CH has been run.

Completely normal.

Carefree
January 2011
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how do I rectify the fault as detailed below?
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