If you’re seeing a Error code on your Sanyo AC system and don’t know what it means, here’s a quick breakdown. This guide will help you understand what the issue might be, whether it’s a sensor, communication issue, or configuration error.
E Series – Communication & Addressing Errors
- E01–E03: Issues between remote controller and indoor unit. Check for address mismatches or incomplete auto addressing.
- E04–E07: Outdoor unit can’t send/receive signals from indoor units.
- E08–E09: Duplicate address setting on indoor units or controllers.
- E10–E12: Signal communication errors with external options or interference from another system during auto addressing.
- E14–E20: Auto address problems. Could be due to wrong unit settings or incomplete system setup.
- E24–E26: Problems between main and sub outdoor units during auto address setup.
- E29: Sub outdoor unit is not receiving signals from the main outdoor unit.
E04–E07: Outdoor unit can’t send/receive signals from indoor units.
E08–E09: Duplicate address setting on indoor units or controllers.
E10–E12: Signal communication errors with external options or interference from another system during auto addressing.
E14–E20: Auto address problems. Could be due to wrong unit settings or incomplete system setup.
E24–E26: Problems between main and sub outdoor units during auto address setup.
E29: Sub outdoor unit is not receiving signals from the main outdoor unit.
F Series – Sensor & Thermistor Faults
- F01–F03: Indoor coil temperature sensor issues.
- F04–F08: Outdoor sensor faults – discharge, coil, or air temperature sensors may be disconnected or faulty.
- F10–F11: Indoor room or discharge air sensor fault.
- F12–F26: Outdoor temperature sensors (multiple areas) are either open-circuit or faulty.
- F29: Indoor EEPROM (memory chip) fault.
- F31: Outdoor EEPROM fault.
F01–F03: Indoor coil temperature sensor issues.
F04–F08: Outdoor sensor faults – discharge, coil, or air temperature sensors may be disconnected or faulty.
F10–F11: Indoor room or discharge air sensor fault.
F12–F26: Outdoor temperature sensors (multiple areas) are either open-circuit or faulty.
F29: Indoor EEPROM (memory chip) fault.
F31: Outdoor EEPROM fault.
H Series – Compressor Protection & Oil Faults
- H01–H03: Compressor 1 problems – overload, lock, or no current.
- H05–H08: Sensor or oil protection faults on Compressor 1.
- H11–H13: Same issues, but for Compressor 2.
- H15–H23: Problems with Compressor 2 or 3 – protection trips, current issues, or sensor faults.
- H25–H28: Discharge temperature or oil sensor issues.
- H31: IPM (Intelligent Power Module) trip – usually from overcurrent or overheating.
H05–H08: Sensor or oil protection faults on Compressor 1.
H11–H13: Same issues, but for Compressor 2.
H15–H23: Problems with Compressor 2 or 3 – protection trips, current issues, or sensor faults.
H25–H28: Discharge temperature or oil sensor issues.
H31: IPM (Intelligent Power Module) trip – usually from overcurrent or overheating.
L Series – Misconfiguration & Wiring Errors
- L02–L03: Indoor/outdoor unit mismatch or duplicate main unit settings.
- L04–L06: Address or operation priority conflicts.
- L07–L13: Group control or capacity settings are wrong or missing.
- L17: Outdoor units with different refrigerants are connected (not allowed).
- L18: 4-way valve failure.
L04–L06: Address or operation priority conflicts.
L07–L13: Group control or capacity settings are wrong or missing.
L17: Outdoor units with different refrigerants are connected (not allowed).
L18: 4-way valve failure.
P Series – Thermostats, Fans & Other Protection Errors
- P01–P02: Thermostat triggered from fan or compressor overload.
- P03–P05: Discharge temp or power-related issues like high pressure or open phase.
- P09–P12: Indoor issues like ceiling panel connection, float switch trigger, or fan overload.
- P16: Compressor wiring phase issue or startup failure.
- P17: Compressor 2 discharge temp error.
- P22: Fan motor or HALL sensor failure.
- P26: Overcurrent detected when compressor runs too fast.
- P29: Inverter error – compressor not running.
- P31: Flexible control error – signal or setting issue.
P03–P05: Discharge temp or power-related issues like high pressure or open phase.
P09–P12: Indoor issues like ceiling panel connection, float switch trigger, or fan overload.
P16: Compressor wiring phase issue or startup failure.
P17: Compressor 2 discharge temp error.
P22: Fan motor or HALL sensor failure.
P26: Overcurrent detected when compressor runs too fast.
P29: Inverter error – compressor not running.
P31: Flexible control error – signal or setting issue.
Need to Reset the System?
Before doing anything else, make sure the issue isn’t just a temporary signal or power glitch. Try powering down the system completely for a few minutes and then restart. If the error comes back, the code gives you a clue where to look.
This guide is here to help you understand what the error code means, but always consult a qualified AC technician before diving into repairs or rewiring.
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Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.