ᐅ Air-to-Water Heat Pump: Current Consumption and Data

tomtom79 schrieb:

Really strange, I’ll write you something so it comes back up again.

Could it be that your pressure relief valve (PRV) is failing, and that’s why the fluctuations are happening?

Yes, please.
The pressure relief valve? That part is completely closed off. That’s how it’s supposed to be.

I have read in the forum that there might be a defect. Do you perhaps still have some in the heating manifold?

:p , there are none in there

At an outside temperature of 9°C (48°F), my heating system shut off earlier; the cycle had started on December 24th.

21.01.21 10:22:08	no faults
24.12.20 04:04:10	no faults

Flow temperature	24.9°C (77°F)
Return temperature	25.8°C (78°F)
Return temperature setpoint	24.5°C (76°F)
Hot gas temperature	38.0°C (100°F)
Outside temperature	9.1°C (48°F)
Average temperature	2.1°C (36°F)

…and I called my heating technician today to have the return flow sensor replaced to rule out that the issue is caused by a faulty return flow sensor.

I sent him the screenshot. At first, he said it was due to the closed radiators that are then opened by the electronic radiator valves (ERVs). After I explained that all ERVs have been open since December 20th, he had no further explanation.

@halmi: Are there any other possible causes for the problematic return flow curve? Any ideas? The heating technician is skeptical that the issue is due to a faulty sensor.