Heat pumps · Error codes · Trianco
09Trianco · Activair (first generation) S300/S500/S800/S1200/S1300/S1800
09 on a Trianco Activair S300/S500/S800/S1200/S1300/S1800: Refrigerant pressure cutout #2
Short answer
On a Trianco heat pump, 09 means: Refrigerant pressure cutout #2. 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: Refrigerant pressure cutout #2.
Part involved: pressure switch / compressor discharge-suction.
Likely causes:
- Leak on refrigerant system.
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
- Note the exact code shown on the controller (a photo helps) and report it to your installer or the manufacturer's service line.
- Check the heat pump's supply breaker/isolator at the consumer unit is on (do not open any casing).
- Check the outdoor unit is not blocked by debris/snow and has its required clearances.
What the engineer will check
- Repair leak, replace refrigerant (only to be carried out by a fully-qualified engineer).
Who to ask for: refrigeration.
Certification: F-gas certified refrigeration engineer (REFCOM or equivalent).
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- Keeps stopping / cutting out on the Activair (first generation) S300/S500/S800/S1200/S1300/S1800: 1 report
Sources
- Trianco Activair Air-to-Water Air Source Heat Pump S300 & S500 - User, Installation, Commissioning & Servicing Instructions (224511) ↗ · 224511 · page 21 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026