ᐅ Air source heat pump frequently stops working intermittently
Created on: 31 Jan 2016 20:37
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HilfeHilfeH
HilfeHilfe31 Jan 2016 20:37Hello,
The house is now 1.5 years old, and we have a Remko air source heat pump for two households. Lately, the heat pump shuts down every few weeks, showing various error messages. Sometimes the hot water tank needs to be recharged, and other times there have been power interruptions. What’s frustrating is when we want to take a bath, the upstairs household has already used hot water, and in the evening you realize, oops, there isn’t enough hot water. The tank is small.
Is it normal for an air source heat pump to be this sensitive and to shut down occasionally? We then restart it by switching the fuse off and on. It powers up, the tank heats slowly, and the hot water takes about 1 to 1.5 hours (in winter) to be ready.
The house is now 1.5 years old, and we have a Remko air source heat pump for two households. Lately, the heat pump shuts down every few weeks, showing various error messages. Sometimes the hot water tank needs to be recharged, and other times there have been power interruptions. What’s frustrating is when we want to take a bath, the upstairs household has already used hot water, and in the evening you realize, oops, there isn’t enough hot water. The tank is small.
Is it normal for an air source heat pump to be this sensitive and to shut down occasionally? We then restart it by switching the fuse off and on. It powers up, the tank heats slowly, and the hot water takes about 1 to 1.5 hours (in winter) to be ready.
Jochen104 schrieb:
Hello,
that also depends on your heat pump settings.
What times do you have set for hot water production?
What target temperature for hot water is set?
How high is the hysteresis?
Do you have any lockout periods? Why would operating settings affect the system going offline?
When the system restarts, hot water is produced, so it can’t be due to lockout periods.
Whether the heat pump sizing plus storage tank capacity is sufficient for filling two full bathtubs is another matter,...
Wastl schrieb:
Why do factory settings affect system interruptions? Are you sure these are really interruptions, or could it be related to the settings?
HilfeHilfe schrieb:
...sometimes there were interruptions in the electricity supply. That sounds like a lockout period to me. That’s why I’m asking.
HilfeHilfe schrieb:
It’s frustrating when we want to take a bath, the upstairs unit has also used hot water, and in the evening you realize, oh no, there’s not enough hot water. The storage tank is small. Without doing the math, but with a 150-liter (40-gallon) storage tank at 60°C (140°F), you can fill about two bathtubs with 40°C (104°F) warm water, compared to a 150-liter (40-gallon) tank at 45°C (113°F). 🙂
In our Viessmann system, for example, you can set whether the entire hot water storage tank or only the upper part is heated.
Another example of what might cause this:
Hot water temperature is set to 45°C (113°F), hysteresis to 8°C (14°F).
Apartment 1 takes a shower → water in the tank drops to 38°C (100°F) → no reheating triggered.
Apartment 2 wants to take a bath afterward → the water temperature only reaches 38°C (100°F). Then the heating system turns on again.
Because 38°C (100°F) water was drawn off, the temperature fell to 37°C (99°F), triggering hot water production. This would have started even without the restart.
These numbers are rough estimates and not precisely calculated, so please don’t take them too literally. And this is just one possible scenario.
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Bauexperte1 Feb 2016 10:24Hello,
No, that is not "normal." However, since I am not a technician, I cannot explain what the cause might be; remotely, it would be like trying to read a crystal ball.
If you do not have a maintenance contract for the system, contact your previous construction partner directly and explain the situation; if you have an active maintenance contract, of course contact the servicing company. Then a technician should come and check the system. It might be "just" a matter of adjustment, maybe a minor part needs to be replaced, or possibly the entire system needs to be exchanged... many possibilities.
In any case, I do not see any need to repeatedly shut down the system in order for it to operate properly. I also do not consider it your responsibility to investigate the cause yourself or to adjust settings on the system without proper guidance.
Regards, Bauexperte
HilfeHilfe schrieb:
Is it normal for the air source heat pump to be so sensitive and to stop working occasionally?
No, that is not "normal." However, since I am not a technician, I cannot explain what the cause might be; remotely, it would be like trying to read a crystal ball.
If you do not have a maintenance contract for the system, contact your previous construction partner directly and explain the situation; if you have an active maintenance contract, of course contact the servicing company. Then a technician should come and check the system. It might be "just" a matter of adjustment, maybe a minor part needs to be replaced, or possibly the entire system needs to be exchanged... many possibilities.
In any case, I do not see any need to repeatedly shut down the system in order for it to operate properly. I also do not consider it your responsibility to investigate the cause yourself or to adjust settings on the system without proper guidance.
Regards, Bauexperte
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