Heat pumps · Error codes · Thermia
max-temp-elec-hwThermia · Atec
max-temp-elec-hw on a Thermia Atec: Too high temperature in heat pump junction box/electrical cabinet
Short answer
On a Thermia heat pump, max-temp-elec-hw means: Too high temperature in heat pump junction box/electrical cabinet. 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: Too high temperature in heat pump junction box/electrical cabinet.
Part involved: cabinet temperature.
Likely causes:
- Overheating of electrical cabinet (causes not tabulated). (causes from the equivalent Danfoss DHP-AQ service instructions VMGFJ202).
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Manual reset: Set operating mode OFF then back to the desired mode.
What you can check
- Note the exact alarm text. Note the alarm and call an engineer; check nothing is covering or blocking ventilation around the unit. Acknowledge once (operating mode OFF then back); if it remains, contact a service technician (user manual 086L0130 p.25).
What the engineer will check
- Inspect cabinet ventilation, loose/overheating connections, component heat.
Who to ask for: heat pump engineer.
Certification: Qualified electrician / heat pump engineer (electrical fault-finding).
What you might notice
Sources
- Service Instructions Atec (VIIFM102) - silo.tips copy ↗ · VIIFM102 · page p.10 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026