Heat pumps · Error codes · Joule
32Joule · Modul-AIR exhaust air heat pump
32 on a Joule Modul-AIR exhaust air heat pump: Back up heater water heater temperature sensor error
Short answer
On a Joule heat pump, 32 means: Back up heater water heater temperature 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: Back up heater water heater temperature sensor error.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Manual reset: Installer override required.
What you can check
- Read and note the code shown on the controller display, then contact your installer or service engineer.
What the engineer will check
- Manual 'possible solution': Check sensor. Replace if necessary.
- Check the named sensor/probe connection at the PCB (loose/oxidised plug).
- Measure sensor resistance against the manufacturer table and replace if faulty.
- Check controller/PCB if sensor is good.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence.
What you might notice
Sources
- Joule Modul-AIR All-E, Modul-AIR All-E with Green Comfort Module & Modul-AIR Aqua - Installation & Maintenance Manual ENG-0026-07 (UK/IE) ↗ · ENG-0026-07 · page 105 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026