issue with baxi 105e combi

24 Jun 2008
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United Kingdom
hello, this is my first post here so any help would be appriciated. Have just changed the diaphram on my baxi 105e but i still have a issue. when the hot water has been used and the tap is switched off, after about 2 minutes the boiler will click into 'humming mode' then fire up c/h (even if selector switch is on hot water only) for about 1-2 mins. It will then click back to humming mode and then eventually back off. did have the 'radiator with a strike though' warning light on a couple of weeks back but nothing since. could it be a temp sensor??? - again, thanks for any assistance.
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Whatever else is happening, it would be wise to change the primary thermistor to eliminate any problem with it.

Relatively cheap, Prt No. 5108265 dry pocket and 'low voltage'.
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