Baxi Combi question

Joined
30 Aug 2009
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Location
Hampshire
Country
United Kingdom
Hello, before I get somebody in, I would like to understand what the fault is. Anybody familiar with combis?
1. pressure is 1.7bar
2. CH appears to be ok (first time I've tried it since Spring); pressure is a stable 1.5bar
3. DHW is where we have a problem; after (cold) bath boiler "Flame failure" and "Safety thermostat" lights both flashing; after reset , its working ...sort of
3a. as water is heating pressure is 2.25bar; as temp builds the pressure starts to waiver (judders between 1.5bar and 2.5bar) and sounds wrong. Issue with DHW pressure differential value?
 
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Your know if its blocked, when you run hot tap it will dump heat down flow pipe. Can be removed a clean bit normally replaced.
 
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Baxi what ? sounds more like a sticking diverter valve but could be wrong.
 

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