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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Keston Celsius 25 service modes
Hello folks,
My Keston Celsius 25 makes a repeating banging noise in the pipework from time to time. I've posted about it here before, but we never got to the bottom of it - it sounds like some sort of pressure oscillation in the pipes (possibly due to an undiscovered airlock somewhere). Anyway I had a Keston service engineer come a couple of weeks ago, using a jumper on the pcb he put the boiler into a service mode where he could control the pump speed directly from the knob on the front panel (but was sadly unable to identify the banging problem). He was rather coy about telling me how to do this. I see there are some Keston experts here - anyone know how to do it? It would be handy in trying to sort out my problem. Also I was interested in Andrew Gabriel's all-singing all-dancing front panel replacement which he posted about in another Keston thread in December, and status outputs available from the unit. Is there any info about this anywhere (or any chance Andrew could email me it)? Tim Mitchell |
#2
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Keston Celsius 25 service modes
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#3
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Keston Celsius 25 service modes
Thanks Andrew,
The noise is a bang-bang-bang noise about 4 times a second, it starts when the boiler modulates down from full output to a low level (usually 1 LED) and goes on for about 15-30 seconds, then it sort of fades away. If you have the case off the boiler you can feel all the pipework twitching. It only does it occasionally and I think it's only when it's doing hot water only and the CH zone valve is closed. I think the supposed air lock is in the return pipe from the hot water coil, which does have a raised section in it where air could get stuck. I have tried every setting of the bypass valve and the gate valve on the CH coil but I can't find a setting which makes any difference. Thanks for the info about service modes. The keston engineer said that it would cut out when the water reaches some maximum temp, though you're cooking your radiators by then. As you say not something to play with. How are you logging your boiler status at the moment - is that just by monitoring the front panel LEDs? -- Tim Mitchell |
#4
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Keston Celsius 25 service modes
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#5
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Keston Celsius 25 service modes
Thanks for the info Andrew.
That's quite a sophisticated heating system you've got there! -- Tim Mitchell |
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