When a heat pump underperforms, the refrigerant circuit is a common culprit. Systematic diagnosis saves time and prevents unnecessary part replacement.
Common refrigerant-related faults
- Low charge / leaks — reduced heat output, low pressures, high superheat
- Overcharge — high pressures, low superheat, possible floodback
- Restrictions — a blocked expansion valve or filter drier causes abnormal pressure splits
- Non-condensables — air in the system raises head pressure
A logical diagnostic approach
- Check the data plate and confirm the correct refrigerant and charge
- Take pressure, temperature, superheat and subcooling readings
- Compare against manufacturer targets
- Leak test if charge is low — never just top up a leaking system
Important: fix leaks, don’t just regas
Topping up a leaking system without finding the leak wastes refrigerant, breaches F-Gas rules and only delays failure. Always locate and repair leaks, then recharge to spec.
FAQ
Why is my heat pump not heating properly? Common causes include low refrigerant from a leak, an incorrect charge, or a restriction in the circuit. Proper readings will pinpoint it.
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