Heat pumps · Error codes · Fujitsu
G29Fujitsu · AIRSTAGE Monobloc Comfort (R32)
G29 on a Fujitsu AIRSTAGE Monobloc Comfort: Outdoor unit communication lost
Short answer
On a Fujitsu heat pump, G29 means: Outdoor unit communication lost. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Outdoor unit communication lost.
Part involved: Outdoor unit communication lost.
Likely causes:
- Loss of connection between controller and outdoor unit.
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.
Manual reset: unknown.
What you can check
- Note the error number shown after pressing the user interface. Check the heat pump breakers/isolators are on.
What the engineer will check
- Check wiring between T26 and interface board.
Who to ask for: Heat pump / refrigeration engineer (manufacturer-trained).
Certification: F-gas certification for refrigerant-circuit work; electrical competence (Part P/18th Edition) for PCB/wiring.
What you might notice
Sources
- INSTALLATION - General Monobloc Comfort Duo, Monobloc 2 services air/water heat pump ↗ · U0780597_2690_EN_3 · page p.36 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026