Heat pumps · Error codes · Alpha Heating Innovation
1015Alpha Heating Innovation · Alpha E-Tec Hybrid (E-Tec EHP 4 kW + E-Tec 33 HB boiler)
1015 on an Alpha Heating Innovation Alpha E-Tec Hybrid: Flow temperature increase (during DHW): Abnormal flow temperature increase in the outdoor unit during DHW mode
Short answer
On an Alpha Heating Innovation heat pump, 1015 means: Flow temperature increase (during DHW): Abnormal flow temperature increase in the outdoor unit during DHW mode. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Flow temperature increase (during DHW): Abnormal flow temperature increase in the outdoor unit during DHW mode.
Part involved: E-Tec EHP outdoor unit.
Likely causes:
- Check pipework connected correctly; check flow sensor; check gas boiler diverter valve.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Note the code and any text shown on the display/controller.
- Check the heat pump isolator and consumer-unit breaker are on.
What the engineer will check
- Check pipework connected correctly.
- check flow sensor.
- check gas boiler diverter valve.
Who to ask for: heat pump engineer.
Sources
- Alpha E-Tec Hybrid - Installation Instructions (package, 06-23) ↗ · E-Tec Hybrid package instructions 06-23 · page 39 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026