Heat pumps · Error codes · INSTAGROUP LTD
Er81INSTAGROUP LTD · InstaGroup instagen ashp
Er81 on an INSTAGROUP LTD InstaGroup instagen ashp: Other faults of direct water pump
Short answer
On an INSTAGROUP LTD heat pump, Er81 means: Other faults of direct water pump. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Other faults of direct water pump.
Part involved: water flow / pump.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
What you can check
- Note the code and check the heating system pressure gauge reading (typically 1-2 bar when cold) and tell your installer if it is low.
- Check that the heat pump isolator / consumer-unit breaker is on and the outdoor unit is not blocked by debris or snow.
- Do not open the unit or top up the system yourself unless your installer has shown you how to use the filling loop; make sure the filling loop is closed afterwards.
What the engineer will check
- Follow the manufacturer's troubleshooting steps for this code.
- Check the relevant sensor/switch wiring and connectors.
- Measure/replace the component or PCB as indicated.
Who to ask for: heating / hydraulic.
What you might notice
Sources
- InstaGen ASHP Installation & Operation Manual ↗ · page 58 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026