Hi guys.
I have a Remeha conventional which is some 12 years old or so, fairly regularly serviced averages about 15-16 months, last done in summer 22, and has worked seemingly faultlessly after the initial installation fiasco.
Twice recently, during the snow last month and today with very heavy frost, it has lockedout with E2 code - return temp higher than flow temp.
Book suggests checking water level & flow, pump runs, temp sensors & wiring etc.
On both ocassions rads have been warm & today we found it just after front door had been open for a while (furniture delivery). We don't recall exact timing of first time but we did have a dozen visitors for lunch on the day.
Plenty of water in header, powering pump directly runs it and I can feel the effect of warm water moving in system, I haven't opened boiler to check sensors & wiring. It resets and goes through the start-up routine fine then instantly works.
What are the chances the boiler had cooled sufficiently that the demand for heat pumped the warm water into the boiler? Or is this not a likely scenario?
I have a Remeha conventional which is some 12 years old or so, fairly regularly serviced averages about 15-16 months, last done in summer 22, and has worked seemingly faultlessly after the initial installation fiasco.
Twice recently, during the snow last month and today with very heavy frost, it has lockedout with E2 code - return temp higher than flow temp.
Book suggests checking water level & flow, pump runs, temp sensors & wiring etc.
On both ocassions rads have been warm & today we found it just after front door had been open for a while (furniture delivery). We don't recall exact timing of first time but we did have a dozen visitors for lunch on the day.
Plenty of water in header, powering pump directly runs it and I can feel the effect of warm water moving in system, I haven't opened boiler to check sensors & wiring. It resets and goes through the start-up routine fine then instantly works.
What are the chances the boiler had cooled sufficiently that the demand for heat pumped the warm water into the boiler? Or is this not a likely scenario?
