Heat pumps · Error codes · Navien
E12Navien · PEM750
E12 on a Navien PEM750: LP protection (LP switch is open)
Short answer
On a Navien heat pump, E12 means: LP protection (LP switch is open). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: LP protection (LP switch is open).
Part involved: compressor / refrigerant circuit.
Likely causes:
- Measure suction pressure running; check EEV step, discharge pressure, water temperatures; check for leaks; recharge to nameplate. Restart manually if it fails more than 3 times in 30 min.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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.
What the engineer will check
- Record high/low pressures, discharge/suction temperatures and EEV steps with the unit running.
- Check water-side flow and air-side coil (blocked/frosted fins).
- Check pressure switches/transducers and wiring.
- Leak-test the refrigerant circuit and correct the charge (F-gas / flammable-refrigerant competent engineer only).
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
- Navien Air to Water Heat Pump UK Service Manual (EN, 250408) ↗ · 250408 · page printed p.69 (PDF p.70) · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026