Hot water but no heating

CRW

Joined
25 Aug 2007
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Location
Merseyside
Country
United Kingdom
I have a Vaillant turboMAX pro that has recently been serviced. I just switched it to central heating mode but no heat is coming through to the radiators. I am getting hot water. The boiler itself is attemoting to switch to heating mode every 10 seconds or so but it keeps failing. There is no warning light on the boiler. The pressure is between 1 and 1.5 as required by the instruction manual.
 
If the boiler fires up for a few seconds from cold when CH is selected then it sounds as if the diverter valve has failed and is stuck in the DHW position.

Tony
 

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