Heil mini split error code P5
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
Mode conflict (multi-zone).
- TypeProtection
- SystemOperation
- Can I fix it?Usually a homeowner fix
What P5 means on a Heil
On a multi-zone system, one indoor unit is asking for heating while another asks for cooling. The outdoor unit can only do one at a time, so the conflicting zone shows P5 and waits.
On this platform, P5 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Two zones set to opposite modes.
- A zone left in Auto mode that flipped to the opposite mode of the others.
How to fix it yourself
You can almost always clear this yourself with the steps below.
- Set every indoor unit to the same mode (all Cool, all Heat, or all Dry). Fan-only mode does not conflict.
- Avoid Auto mode on multi-zone systems; it is the usual cause of the conflict.
- The first zone to call sets the mode for the whole system.
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
Not a fault. No technician needed.
If yours is a DLC4 / DLF4 series, 2013 to 2015 (Gree-built) unit
Compressor current protection.
- TypeProtection
- SystemCompressor / inverter
- Can I fix it?Technician job
What P5 means on a Heil
Current in the compressor windings exceeded the limit and the drive shut down.
On this platform, P5 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 blocked outdoor coil or failed fan.
- Low supply voltage.
- A failing compressor.
- A refrigerant overcharge.
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.
- 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.
- 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.
- 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.
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
Technician check of compressor current and charge.
Which Heil units show P5
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), P5 means mode conflict (multi-zone); on the DLC4 / DLF4 series, 2013 to 2015 (Gree-built), P5 means compressor current protection. 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 P5:
P5 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Pioneer P5 Mode conflict (multi-zone) / Condenser high temperature protection (outdoor display)
- Blueridge P5 Compressor current protection / Mode conflict (multi-zone)
- Gree P5 Compressor current protection
- Zone Air P5 Cooling mode sub-cooling (anti-freeze) protection
- Mitsubishi Electric P5 Drain pump fault (overflow protection)
- Carrier P5 Mode conflict (multi-zone)
- Trane P5 Cooling mode sub-cooling (anti-freeze) protection / Drain pump fault (overflow protection)
- Tempstar P5 Mode conflict (multi-zone) / Compressor current protection
- ACiQ P5 Mode conflict (multi-zone) / Cooling mode sub-cooling (anti-freeze) protection
Questions people ask
Why does P5 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 P5 as mode conflict (multi-zone); DLC4 / DLF4 series, 2013 to 2015 (Gree-built) units read P5 as compressor current protection.
Can I reset a Heil P5 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If P5 comes back, the fault is real and needs the checks above.
Is it safe to keep running a Heil showing P5?
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.