F.732 on a Glow-worm GeniaAir: Compressor outlet temperature too high
Short answer
On a Glow-worm heat pump, F.732 means: Compressor outlet temperature too high. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Compressor outlet temperature too high.
Part involved: Compressor outlet temperature too high.
Likely causes:
- The compressor outlet temperature is above 130 °C: Application limits exceeded, EEV is not working or does not open correctly, refrigerant volume too low, (frequent defrosting due to extremely low evaporation temperatures).
- Glow-worm trade page: Compressor outlet temperature too high Fault in the electrical connection of the compressor inlet or outlet temperature sensor, compressor inlet or outlet temperature sensor fault, electronic expansion valve fault, refrigerant volume too low, building circuit flow rate too low, blocked or restricted filter or Y ….
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: no - the fault remains displayed until the cause is eliminated.
Manual reset: yes - after the cause is eliminated, press the reset button (indoor unit) or reset via the system control; if it recurs after several resets contact customer service.
What you can check
- Note the full code and text shown on the display (and the date/time it appeared). Check the outdoor unit's air inlet and outlet are not blocked by leaves, debris, snow or ice build-up and clear any loose debris from around it (do not open the casing, poke the fins or use tools). Glow-worm's MiPro Sense operating instructions say always contact your competent person in the event of a fault message; until they arrive you may select a limp-home (back-up heater) setting on the control, which is expensive to run. If you smell gas/solvent near the outdoor unit or hear hissing, switch the heat pump off at the isolator, keep ignition sources away and call an engineer.
What the engineer will check
- Check the compressor inlet sensor and outlet sensor. 2. Check the condenser outlet temperature sensor (TT135). 3. Check the EEV (does the EEV move to the limit stop? Use the sensor/actuator test). 4. Carry out a leak-tightness test. 5. Check whether the service valves on the outdoor unit are open.
Who to ask for: F-gas certified refrigeration engineer with heat pump experience (R290 flammable-refrigerant competence required for aroTHERM plus / GeniaAir).
Certification: F-gas Category I (Regulation (EU) 517/2014 as retained in GB) certificate; flammable (R290) refrigerant training for R290 units.
What you might notice
Sources
- GeniaAir Appliance Interface installation and maintenance instructions ↗ · 8000043014_01 · page HPIM 7 8000043014_01 p.32 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026