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Baxi Combi fault
grumpycrab
Posts: 5,043 Forumite
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?
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?
0
Comments
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What model is it? When you run the water does in work at all or just got to the lockout lights?0
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Its a 105E. Since resetting I haven't seen the lights; it does work until temp of water gets high; that's when the pressure starts to judder and the boiler itself is making a strange noise. As if there's a DHW blockage (but only when the water gets hot). Or perhaps a valve isn't openning enough...What model is it? When you run the water does in work at all or just got to the lockout lights?0 -
Before it cuts out does the flame light cycle on and off giving you fluctuation in water temperature.
Sounds like a restricted plate heat exchanger to me.0 -
Yes, the flame light does cycle; that's been a symptom of this boiler for a while (water never runs at a contant hot temp).Is that a clean out job or a new heat exchanger do you think? Thanks by the way. PS CH appears to be ok.Before it cuts out does the flame light cycle on and off giving you fluctuation in water temperature.
Sounds like a restricted plate heat exchanger to me.0 -
Yes certainly sounds like blocked plate heat exchanger. Clean out with a acid cleaner or replace, to be honest there only about £50 for a new one so probably worth replacing. Would be worth investing in a magnet system filter hopefully that will stop it happening again.0
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