Heat pumps · Error codes · Grant
E6Grant · Aerona³ R32
E6 on a Grant Aerona³ R32: Plate heat exchanger temp. sensor error
Short answer
On a Grant heat pump, E6 means: Plate heat exchanger temp. sensor error. 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: Plate heat exchanger temp. sensor error.
Part involved: plate heat exchanger thermistor.
Likely causes:
- Plate heat exchanger temperature sensor faulty.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Yes (Chofu 'Auto').
Manual reset: Not required (auto).
What you can check
- Note the exact code shown on the controller display and tell your installer or Grant-trained engineer.
- Grant advises homeowners NOT to reset Aerona3 fault codes themselves - leave the reset to the engineer.
What the engineer will check
- Check the resistance by tester; replace if faulty.
Who to ask for: Grant-trained heat pump engineer.
What you might notice
What owners and engineers report
5 owner and engineer reports mention this.
- No heating on the Aerona³ R32: 5 reports
Sources
- Chofu Service Manual AEYC-0643XU-CH / 1043XU-CH / 1242XU-CH / 1643XU-CH (RA-98(5)) - Air to Water Heat Pump, Monobloc DC Inverter ↗ · RA-98(5) · page 29 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026