58 on a Viessmann Vitotronic 200: Liquid gas supercooling too high
Short answer
On a Viessmann heat pump, 58 means: Liquid gas supercooling too high. The heat pump keeps running.
Reviewed 23 September 2026 · 1 source
What it means
The manuals for this range word it in different ways:
- Liquid gas supercooling too high.
- Cylinder sensor top: If only the upper cylinder temperature sensor is present: No DHW heating; If an additional lower temperature sensor is installed: DHW heating possible, switched on and off ….
Part involved: Liquid gas supercooling too high; Cylinder sensor top.
When it shows: No type given. Heat pump characteristics: Compressor remains in operation. If only the upper cylinder temperature sensor is present: No DHW heating; If an additional lower temperature sensor is installed: DHW heating possible, switched on and off via this sensor.
Likely causes:
- Liquid gas supercooling too high.
- Lead break, top cylinder temperature sensor.
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The heat pump keeps running.
Resetting itself: Not stated in 6150133.
Manual reset: Refrigerant circuit messages cannot be acknowledged in the message history (6150133 p.155); acknowledge the resulting 05/07/A9 message on the control unit.
What you can check
- This code is only visible to engineers in the service menu (Diagnosis > Refrigerant circuit > Message history); homeowners see message 05, 07 or A9 - note that code and call your contractor.
- Note the 2-character message code and message text shown on the Vitotronic 200 display (press OK for details) and give them to your heating contractor (operating instructions 5817913 p.56).
- You may acknowledge the message once with OK as described in the Vitotronic 200 operating instructions; if it reappears, do not keep acknowledging it - call your contractor.
- Check the heat pump breaker/isolator in the consumer unit is ON (do not repeatedly reset a breaker or RCD that keeps tripping).
What the engineer will check
- Check secondary circuit flow rate. If.
- necessary, increase the flow rate. Check installation position of the liquid gas temperature sensor: See "Internal components". Check resistance value (NTC 10 k).
- Ω at connection J13 (T5) on the EEV PCB: See "EEV PCB [4] ".
- Check resistance value (NTC 10 k Ω) at plug F6 or at terminals X25.5/X25.6: See "Controller and sensor PCB".
Who to ask for: Viessmann-trained heat pump engineer with F-gas refrigeration certification; Viessmann-trained heat pump installer/service engineer.
Certification: F-gas certificate (UK F-gas Regulations; Viessmann: refrigerant work by authorised refrigeration engineers only).
What you might notice
Sources
- Service instructions Vitotronic 200 type WO1C heat pump control unit (air/water split & monobloc, brine/water) (6150133, 2023-07) ↗ · 6150133 VSA00004 · pages 163, 93 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026