Heat pumps · Error codes · TCL
D5TCL · tri thermal r32 monobloc
D5 on a TCL tri thermal r32 monobloc: Plate heat exchanger refrigerant liquid pipe (temperature) is abnormal
Short answer
On a TCL heat pump, D5 means: Plate heat exchanger refrigerant liquid pipe (temperature) is abnormal. 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: Plate heat exchanger refrigerant liquid pipe (temperature) is abnormal.
Part involved: refrigerant circuit.
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 shown on the controller and the model number on the rating label before contacting your installer.
- Check that the heat pump isolator / consumer-unit breaker is on; do not open any casing.
- A single restart via the controller (off/on) may be tried only if the manual or your installer allows it.
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: F-gas / refrigerant.
What you might notice
Sources
- TCL Tri-Thermal Monobloc 4kW Installation and Owner's Manual (ManualsLib, multilingual) ↗ · page 178 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026