Heat pumps · Error codes · Warmflow
Service-dueWarmflow · Zeno G-Series ground source heat pump GS08/GS16/GS03
Service-due on a Warmflow Zeno G-Series ground source heat pump GS08/GS16/GS03: Service is due
Short answer
On a Warmflow heat pump, Service-due means: Service is due. 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: Service is due.
Part involved: controller configuration / service.
Likely causes:
- The appliance requires a service within the time displayed.
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | Yes |
The heat pump keeps running.
What you can check
- Note the exact code shown on the controller (a photo helps) and report it to your installer or the manufacturer's service line.
- Check the heat pump's supply breaker/isolator at the consumer unit is on (do not open any casing).
What the engineer will check
- Service the appliance (Warmflow engineer or other competent, trained engineer).
Who to ask for: heat pump commissioning.
Certification: Manufacturer-trained commissioning engineer.
Sources
- Warmflow High Efficiency Variable Speed Ground Source Heat Pumps G-Series GS08 / GS16 - User, Installation & Service Instructions (v6) ↗ · v6 · page 56 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026