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Underfloor heating not switching on

Diyisfun

Diyisfun

Joined
15 Jun 2004
Messages
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Location
Norwich
Country
United Kingdom
Boiler is firing up on main heating.
When underfloor is called for nothing.
I'm guessing what should happen, is pump starts, divert valve activates & then Boiler should fire.
I'm guessing at fault with pump, am I on the right lines.
 
I have just removed, then replaced the batteries in the programmer & it's fired up & running. So bit like reboot.
But would like to know what the sequence is.
 

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