UA-60 on a Daikin Altherma LT monobloc: PCB combination malfunction
Short answer
On a Daikin heat pump, UA-60 means: PCB combination malfunction. 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: PCB combination malfunction.
Part involved: inter-unit communication / PCB combination.
When it shows: Communication between hydro PCB A1P and extension PCB A4P has failed.
Likely causes:
- See possible cause for UA error.; Faulty extension PCB A4P.; Malfunction of connection cable between hydro PCB A1P and current loop PCB A2P Faulty current loop PCB A2P Malfunction of connection cable between current loop PCB A2P and extension PCB A4P.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Manual reset via user interface.
What you can check
- Read the full error code and sub-code shown on the user interface (Malfunctioning screen; press the help button for Daikin's long description) and note it, with the date/time, for your installer.
What the engineer will check
Who to ask for: Heat pump installer (Daikin-trained).
Certification: None specific; MCS-certified installer recommended.
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- No heating on the Altherma LT monobloc: 1 report
Sources
- Service manual Daikin Altherma Monobloc CA EBLQ/EDLQ05-07CAV3 (ESIE15-08B) ↗ · ESIE15-08B · page 40 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026