Heat pumps · Error codes · CTC
E087CTC · control system alarm/information platform (error-code grouping)
E087 on a CTC control system alarm/information platform: Driver: inverter driver fault
Short answer
On a CTC heat pump, E087 means: Driver: inverter driver fault. 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: Driver: inverter driver fault.
Part involved: compressor inverter driver.
Likely causes:
- Inverter driver fault (numbered).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Manual reset: Press "Reset alarm" on the display; a persisting fault must be rectified before it can be reset.
What you can check
- If the manual instruction applies, press "Reset alarm" on the display once and note whether the alarm returns (manual: press reset and check whether the alarm recurs).
- Note the alarm code/text, the product model and serial number and contact your installer and the driver error number shown.
What the engineer will check
- Check inverter driver, its supply voltage and temperature, and communication wiring.
Who to ask for: heat pump inverter / electrical.
Certification: Electrical competence; F-gas if refrigerant work needed.
What you might notice
Sources
- CTC EcoZenith i255 Installation and Maintenance Manual (400V 3N~/230V 1N~/230V 3~) ↗ · 162 505 67-9 CR01164 2026-05-10 · page 81 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026