163 on a Mitsubishi Heavy Industries Air-Conditioning Europe Hydrolution: High condenser in temperature: Condenser in has reached max permitted temperature (self-resetting)
Short answer
On a Mitsubishi Heavy Industries Air-Conditioning Europe heat pump, 163 means: High condenser in temperature: Condenser in has reached max permitted temperature (self-resetting). 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: High condenser in temperature: Condenser in has reached max permitted temperature (self-resetting).
Part involved: High condenser in temperature.
When it shows: Condenser in has reached max permitted temperature (self-resetting).
Likely causes:
- Incorrectly set heating curve; low heating medium flow; undersized heating system; (R410A manual) temperature generated by another heat source.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: yes.
Manual reset: no.
What you can check
- Note the alarm number/text shown on the display. Check the consumer-unit breakers/isolators for the indoor and outdoor units are on. Check radiator/underfloor thermostats in the house are not all closed (user manual). Check the heating system pressure gauge reads in the normal range (about 0.5-1.5 bar when cold for Hydrolution per user manual). This is an information message; it resets automatically when the cause is removed.
What the engineer will check
- Per manual 'May be due to': Incorrectly set heating curve; low heating medium flow; undersized heating system; (R410A manual) temperature generated by another heat source. Check sensor wiring/resistance, settings, flow (particle filter, pump) and supply as applicable.
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 Manual - Air to Water Heat Pump using R32 refrigerant, Hydrolution (HM) ↗ · PSC012D169 (202201) · page PDF p.86 (printed 84) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026