Ariston condensing system boilder CH pump overrun

Joined
29 Jan 2008
Messages
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Location
Berkshire
Country
United Kingdom
Hi I have a Ariston microGenus 27 system boiler (condensing)

Separate Room stat (simple drayton analogue)

Seperate timer.

This is a new issue I have not seen before

1. CH and HW set for morning, room temp on stat set at 23c
2. Boiler runs fine for 30mins
3. CH pump overrrun keeps cutting in every 1 min At 66c on boiler temp
4. Raise room stat to 25c - CH will run for a bit longer then again cycles of CH pump overrun ever 1 min

Does this look like a faulty room stat?

All help appreciated

Akbar
 
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