Heat pumps · Error codes · Cool Energy
AL007Cool Energy · inverTech (R410A, Carel control)
AL007 on a Cool Energy inverTech: Water flow switch
Short answer
On a Cool Energy heat pump, AL007 means: Water flow switch. 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: Water flow switch.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Read and note the code shown on the controller display, then contact your installer or service engineer.
- Check the heating system pressure gauge reading against the value in your handover documents (manufacturer commissioning values: typically 1-2 bar) and that the filling loop is closed.
What the engineer will check
- Check water flow rate/flow switch and wiring.
- Check strainer/magnetic filter for blockage.
- Vent air from the system.
- Check circulating pump operation and pipe sizing.
- Check valves/zone valves are open.
Who to ask for: heating / plumbing heat pump installer.
Certification: None specific (unvented/G3 if cylinder work).
What you might notice
Sources
- Cool Energy inverTech Monoblock Series Heat Pump Water Heaters - Installation and Users Guide v6.6 (2020) ↗ · Version 6.6 · page 28 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026