Heat pumps · Error codes · Sime
PdSime · SHP M Pro
Pd on a Sime SHP M Pro: High temperature protection of air side heat exchanger temperature (T3)
Short answer
On a Sime heat pump, Pd means: High temperature protection of air side heat exchanger temperature (T3). 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: High temperature protection of air side heat exchanger temperature (T3).
Part involved: see manual.
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 unit's rating label before contacting your installer.
- Check that the heat pump's isolator and consumer-unit breaker are on; do not open any casing.
- Check the outdoor unit is not blocked by snow, ice, leaves or debris, and do not clear ice from the fins with tools.
What the engineer will check
- Follow the manufacturer's troubleshooting for this code.
Who to ask for: Heat pump engineer.
Certification: Heat pump installer competence; F-gas and flammable-refrigerant (R32/R290) handling competence for any refrigerant-circuit work.
What you might notice
Sources
- Sime SHP M PRO Installation manual 6332386 R3 (IT/EN/ES/EL) ↗ · R3 · page printed p.58 (PDF p.129) · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026