DIY HVAC Tools

Heil mini split error code P0

2 meanings on Heil, depending on which series you have. Check the model number on the indoor unit's label.

If yours is a DLC/DLF series, 2015 and later (Midea-built) unit

Inverter module (IPM) malfunction.

  • TypeProtection
  • SystemCompressor / inverter
  • Can I fix it?Technician job

What P0 means on a Heil

The inverter power module that drives the compressor reported a fault: over-current, over-temperature, or an internal error. The outdoor unit shuts down to protect the compressor and the module.

On this platform, P0 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.

Common causes

  • The outdoor coil is blocked or the fan has failed, so the module is overheating.
  • Low or unstable supply voltage causing the module to draw excess current.
  • A failing compressor drawing more current than the module can supply.
  • A failed IPM or outdoor main board.
  • Loose compressor terminal connections.

How to fix it yourself

Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.

  1. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
  2. Look at the outdoor unit: clear leaves, cottonwood fluff, snow or ice from the coil and make sure the fan can spin freely and nothing is stacked against the cabinet.
  3. If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.
  4. If the code appears only on the hottest afternoons or during peak heating, heat rejection is the suspect. Clean the outdoor coil thoroughly.
  5. Do not keep resetting and running the unit. Repeated IPM trips can take the compressor with them.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

This is a technician diagnosis: they will check compressor windings, module output and DC bus voltage. Plan for a board or compressor repair conversation.

If yours is a DLC4 / DLF4 series, 2013 to 2015 (Gree-built) unit

IPM reset (drive module restarted).

  • TypeProtection
  • SystemCompressor / inverter
  • Can I fix it?Technician job

What P0 means on a Heil

The inverter power module reset itself, usually after a fault or a power dip. If it shows once and clears, ignore it; repeated P0 points at the drive.

On this platform, P0 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.

Common causes

  • A momentary power interruption.
  • An IPM fault (see H5).
  • A failing drive board.

How to fix it yourself

Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.

  1. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
  2. If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

Repeated P0 needs a technician to test the drive.

Which Heil units show P0

Heil sells DLCSRA / DLCSRB / DLCLRA outdoor with DLFSHA / DLFSFA indoor (2015 and later) and DLC4 / DLF4 (2013 to 2015) units, and this code carries more than one meaning across them: on the DLC/DLF series, 2015 and later (Midea-built), P0 means inverter module (IPM) malfunction; on the DLC4 / DLF4 series, 2013 to 2015 (Gree-built), P0 means iPM reset (drive module restarted). The model number on the indoor unit's label, and which display you are reading, tell you which applies.

Where Heil shows this code

DLC/DLF series, 2015 and later (Midea-built): The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.

DLC4 / DLF4 series, 2013 to 2015 (Gree-built): The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.

Other Heil codes

Same part of the system as P0:

P2High temperature protection (compressor top or inverter module)P4Inverter compressor drive errorF9High discharge temperature frequency limiting (protection)H3Compressor overload protectionH5IPM (inverter module) protectionH7Compressor desynchronization (loss of sync)LcCompressor start failureLdCompressor phase loss or phase sequence error
E0Indoor unit EEPROM parameter errorE1Communication error between indoor and outdoor units / High pressure protectionE2Zero-crossing signal detection error / Indoor anti-freeze protectionE3Indoor fan speed out of control (indoor fan motor fault) / Low pressure protection (refrigerant shortage or blockage)E4Indoor room temperature sensor (T1) open or short circuit / Compressor discharge temperature too highE5Evaporator coil temperature sensor (T2) open or short circuit / Over-current protectionECRefrigerant leak detected (low refrigerant charge)F0Overload current protection (compressor over-current) / Refrigerant shortage or system blockage detected

All Heil error codes

P0 on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

  • Pioneer P0 Inverter module (IPM) malfunction
  • Blueridge P0 IPM reset (drive module restarted) / Inverter module (IPM) malfunction
  • Gree P0 IPM reset (drive module restarted)
  • Zone Air P0 IPM module protection
  • Tempstar P0 Inverter module (IPM) malfunction / IPM reset (drive module restarted)
  • ACiQ P0 Inverter module (IPM) malfunction / IPM module protection

Questions people ask

Why does P0 have more than one meaning on a Heil?

Heil sells units built on more than one control platform, and each platform has its own code table. The model number on the indoor unit's label tells you which series you have: DLC/DLF series, 2015 and later (Midea-built) units read P0 as inverter module (IPM) malfunction; DLC4 / DLF4 series, 2013 to 2015 (Gree-built) units read P0 as iPM reset (drive module restarted).

Can I reset a Heil P0 code myself?

Yes. Turn the system off at the breaker for five minutes, then restart it. If P0 comes back, the fault is real and needs the checks above.

Is it safe to keep running a Heil showing P0?

Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.

Sources

  • ICP DLCSRA Outdoor Unit Single Zone Ductless Service Manual 32808000801 (error code table)
  • ICP ductless installation instructions IM-KSAIC04-04 (DLCPRA / DLCSRB / DLCERB / DLCLRA error codes)
  • ICP R-410A Ductless Split System Service Manual 421 01 9204 00 (DLC4 / DLF4, 2013)

Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.