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Valliant Eco tec combi HE - heating issue plumbing question
Hi everyone,

I have an issue with Valliant eco tec combi, tenant complaining heating is coming on sometimes when programable wired room stats (danfoss) are up to temperature. Typically when i attend it is always working fine so intermittent fault. I replaced both room stats for first measure but still happening, customer sent me display on boiler & egg timer was on display.

Looking online this seems to be a pump run feature and it was doing this whilst i was on site but it didn't seem to causing the heating to warm up & the boiler was not firing whilst this was displayed on site.

At the moment i am putting it down to a sticking 2 port switch on motorise valve (as 2 zone circuit) but wondering if anyone else has come across this problem with this particular boiler and could know the cause as failing the 2 port working i am thinking it could only be PCB which as far as i am aware of you can not test for faults??

Any Help much appreciated.
Thanks

Valliant Eco tec combi HE - heating issue

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