DI6 on a Kensa Shoebox: High pressure switch open circuit (twin compressor only)
Short answer
On a Kensa heat pump, DI6 means: High pressure switch open circuit (twin compressor only). The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: High pressure switch open circuit (twin compressor only).
Part involved: High-pressure switch (compressor 2).
When it shows: Error level per manual: Fault.
Likely causes:
- Load-side flow restriction (often with FLH2/FLC2), load pump failure.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
Manual reset: unknown.
What you can check
- Note the code shown on the controller/LED; check the heat pump isolator and consumer-unit breaker are on; check thermostat/timer settings.
What the engineer will check
- Follow Kensa fault table actions: Load-side flow restriction (often with FLH2/FLC2), load pump failure.
Who to ask for: Refrigeration engineer (F-gas certified) / Kensa technical support.
Certification: F-gas Category I (refrigerant circuit work); MCS-certified GSHP installer.
What you might notice
Sources
- Shoebox Heat Pump Operational Manual (User Manual) ↗ · Version 8 · page 26 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026