ᐅ Nibe F750, 10 years old and faulty

Hello everyone,

My air source heat pump Nibe F750 has been malfunctioning for a week now, and all technicians worldwide are unavailable!
That’s why I want to ask you what I should do now.

Three weeks ago, our basement was flooded with rainwater.
Fortunately, the water was only 1 cm (0.4 inches) high and did not come into contact with the heat pump.
To help dry out the floor, I set the water temperature for the underfloor heating to 33°C (91°F).

After one week, I reset it back to 22°C (72°F).
A few days later, the first alarm appeared, indicating that the heating system could not generate heat.
Possible causes were, for example, “Defrosting takes too long… etc.”

I switched the heating system off and on several times. During this, about 100 ml (3.4 fl oz) of water dripped from the exhaust module two to three times – it is probably condensate?

Then a “High Pressure Alarm” occurred, and now there is a constant “Temperature Limiter Alarm.”

I gave the system a day of rest, performed a reset for “Temperature Limiter FQ10” on page 12, but the same alarm keeps recurring.

I found a small metal part on the floor of the exhaust module but don’t know what it is for...

In emergency mode, the system does not produce heat, and the power consumption is consistently around 0.10 to 0.16 kWh.

Can someone please help us?
Thank you very much for your attention!

johannchang schrieb:

I found a small metal part on the floor of the exhaust module but don’t know what it’s for...

That is a valve from a bicycle or car tire.