A06.117 on a Baxi HP60 / Baxi Assure HP55 High Temperature Monobloc ASHP: ODU backup error Electric heating plate relay adhesion failure in the internal backup heater PCB
Short answer
On a Baxi heat pump, A06.117 means: ODU backup error Electric heating plate relay adhesion failure in the internal backup heater PCB. The heat pump keeps running. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: ODU backup error Electric heating plate relay adhesion failure in the internal backup heater PCB.
Part involved: power supply / PCB.
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The heat pump keeps running.
Resetting itself: yes - may disappear spontaneously if conditions improve.
Manual reset: not required.
What you can check
- Note the exact code shown on the controller and when it appeared.
- Check the heat pump's consumer-unit breaker / isolator is on (do not open any panels).
- The manual's user steps allow switching the system off and on once to see if the error clears; if the code returns, contact the installer.
- If the code persists or returns, contact a heat pump engineer.
What the engineer will check
- Diagnose per manufacturer service procedure (manual gives description only).
Who to ask for: heat pump engineer with electrical competence.
Certification: Qualified electrician / manufacturer-trained heat pump engineer; F-gas if refrigerant circuit is opened.
What you might notice
Sources
- Installation, user and service manual - Indoor unit ASHP Control ↗ · 7887625 - v04 - 22072025 · page 125 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026