Heat pumps · Error codes · Cool Energy
Er13Cool Energy · Inverter range CE-iH (R410A, c.2020)
Er13 on a Cool Energy Inverter range CE-iH: Water pressure fault
Short answer
On a Cool Energy heat pump, Er13 means: Water pressure fault. 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 pressure fault.
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 and restore system pressure via filling loop.
- Check for leaks and expansion vessel charge.
- Check water pressure sensor/switch and wiring.
Who to ask for: heating / plumbing heat pump installer.
Certification: None specific.
What you might notice
Sources
- Cool Energy Inverter Monoblock Series Heat Pump Water Heaters - Installation and Users Guide Version 5 ↗ · Version 5 · page 22 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026