Parking AC Error Codes — Full Reference List

• Table of Contents

1. Sensor errors — E1, E2, E3
2. Pressure switch errors — P1, P2
3. Power errors — F1, F2, F3, F4, F5
4. Communication errors — C1, C2
5. Motor errors — H1, H2
6. Resetting and reading historical fault log

This is the consolidated error-code reference for the four VS02 PRO / ZH 1000 / VC 1000 / VC 2000 controller platforms. Codes are grouped by category — sensor, pressure, power, communication and motor — with root cause and recommended field action for each.

Sensor errors — E1, E2, E3

E1: cabin / return-air NTC open or short. Check sensor connector and resistance (10 kΩ at 25°C). E2: evaporator coil NTC open or short. E3: ambient / condenser NTC open or short. Replace faulty sensor — typical part cost under USD 10.

Pressure switch errors — P1, P2

P1: high-pressure switch open (>3.0 MPa). Causes: condenser fan failure, condenser blockage, refrigerant overcharge. P2: low-pressure switch open (<0.05 MPa). Cause: refrigerant leak. Diagnose and fix root cause before resetting.

Power errors — F1, F2, F3, F4, F5

F1: IPM over-current. F2: IPM over-temperature. F3: compressor over-temperature. F4: DC bus over-voltage. F5: DC bus under-voltage. F1/F2 usually indicate compressor or controller failure. F3 indicates inadequate cooling — check coolant or oil. F4/F5 are battery/charging system issues.

Communication errors — C1, C2

C1: indoor-to-outdoor unit communication lost. Check the 4-wire harness between indoor and outdoor sections. C2: HMI display to mainboard communication lost. Re-seat the ribbon cable.

Motor errors — H1, H2

H1: indoor fan motor stall. Check for obstruction or failed Hall sensor. H2: outdoor / condenser fan motor stall. Same diagnostic. Both fan motors are field-replaceable plug-and-play assemblies.

Resetting and reading historical fault log

Power-cycle for 60 seconds to clear active codes. Historical log requires the Vethy service tool — request via Email service@vethy.com or call +86-532-87729918 for service manuals, spare-parts catalogues and warranty support within 24 hours.

Frequently asked questions

Where is the error code displayed?

On the 7-segment display of the indoor HMI, or as a blink pattern on the controller LED if no HMI is fitted.

Can I clear an error code by disconnecting the battery?

Yes — power-cycle for 60 seconds. However, if the root cause is not fixed, the code will reappear within minutes of restart.

Which error codes indicate a refrigerant problem?

P2 (low-pressure switch open) is the primary refrigerant-leak indicator. P1 (high-pressure) can also indicate overcharge.

Which error codes are warranty-covered?

F1 (IPM over-current) and F2 (IPM over-temp) when root cause is component failure, plus motor errors H1/H2 in the first 12 months. Sensor errors E1–E3 are typically warranty within 6 months.

Is there a service tool for reading historical faults?

Yes — Vethy provides a USB diagnostic adapter and Windows service app for authorised technicians.

How do I request a copy of the service manual?

Email service@vethy.com or call +86-532-87729918 for service manuals, spare-parts catalogues and warranty support within 24 hours.