Thermal Zone AC Error Codes and Troubleshooting

This air conditioning system has been provided with built in self diagnostic error codes. Please refer to the following table for error code definitions:

Thermal Zone AC Error Codes and Troubleshooting

Error Code	Malfunction Name
H4	System Overload. Heating LED: 4 Flashes
H3	Compressor Overload Protection. Heating LED: 3 Flashes
H5	IPM Protection. Heating LED: 5 Flashes
E1	High-Pressure Protection. Running LED: 1 Flash
E2	Anti-Freezing Protection. Running LED: 2 Flashes
E4	Exhaust Protection. Running LED: 4 Flashes
E5	Over Current Protection. Running LED: 5 Flashes
E7	Mode Conflict. Running LED: 7 Flashes
E6	Communication Malfunction. Running LED: 6 Flashes
H1	Defrost or Oil Return of Heat. Heating LED: 1 Flash

Troubleshooting

Thermal Zone Mini-split Troubleshooting Guide

The first step in troubleshooting is to disconnect power for 30 seconds to allow the unit to reset. If this does not rectify the problem proceed with the troubleshooting chart below.

Problem: The unit does not run.

Troubleshooting:

1. Is the power off?
2. Is the circuit protection device tripped?
3. Is voltage too high or low? (Tested by a professional)
4. Is the Timer on?
5. A 3 minute delay occurs before each compressor start.

Problem: Cooling and or Heating efficiency is not good.

Troubleshooting:

1. Is temperature setting correct?
2. Are the inlet or outlet vents obstructed?
3. Is the filter clean?
4. Are windows and doors closed?
5. Is fan set to low speed?
6. Is there a heat source in the room?

Problem: Wireless remote control is not working.

Troubleshooting:

1. Reset unit. Disconnect main power for 30 seconds then reapply.
2. Is it within receiving range? Is it obstructed?
3. Replace the batteries.
4. Is remote control damaged?

Problem: Water leaking into room.

Troubleshooting:

1. The air humidity is excessively high. Check to see if all windows and doors are closed.
2. Call service Tech if not corrected by the above action.

Problem: Water leakage in outdoor unit.

Troubleshooting:

1. When the unit is running in Auto Defrosting mode, ice will thaw and drip into pan.
2. When the unit is running in HEAT mode, the water adhered to the condenser coil drains into pan.

Problem: Noise from indoor unit emitted.

Troubleshooting:

1. When defrosting is started or stopped, it will make a sound. This is due to the refrigerant flow reversing directions.
2. Normal refrigerant flowing in unit.

Notes: 

1. If E7 error code occurs, see the AUTO mode section in Operators Manual on page 7 .
2. An audible beep will be heard, when a button is pressed, if the remote control is communicating with the receiver.

Thermal Zone AC Error Codes and Troubleshooting

This air conditioning system has been provided with built in self diagnostic error codes. Please refer to the following table for error code definitions:

Thermal Zone AC Error Codes and Troubleshooting

Error Code	Malfunction Name
H4	System Overload. Heating LED: 4 Flashes
H3	Compressor Overload Protection. Heating LED: 3 Flashes
H5	IPM Protection. Heating LED: 5 Flashes
E1	High-Pressure Protection. Running LED: 1 Flash
E2	Anti-Freezing Protection. Running LED: 2 Flashes
E4	Exhaust Protection. Running LED: 4 Flashes
E5	Over Current Protection. Running LED: 5 Flashes
E7	Mode Conflict. Running LED: 7 Flashes
E6	Communication Malfunction. Running LED: 6 Flashes
H1	Defrost or Oil Return of Heat. Heating LED: 1 Flash

Troubleshooting

Thermal Zone Mini-split Troubleshooting Guide

The first step in troubleshooting is to disconnect power for 30 seconds to allow the unit to reset. If this does not rectify the problem proceed with the troubleshooting chart below.

Problem: The unit does not run.

Troubleshooting:

1. Is the power off?
2. Is the circuit protection device tripped?
3. Is voltage too high or low? (Tested by a professional)
4. Is the Timer on?
5. A 3 minute delay occurs before each compressor start.

Problem: Cooling and or Heating efficiency is not good.

Troubleshooting:

1. Is temperature setting correct?
2. Are the inlet or outlet vents obstructed?
3. Is the filter clean?
4. Are windows and doors closed?
5. Is fan set to low speed?
6. Is there a heat source in the room?

Problem: Wireless remote control is not working.

Troubleshooting:

1. Reset unit. Disconnect main power for 30 seconds then reapply.
2. Is it within receiving range? Is it obstructed?
3. Replace the batteries.
4. Is remote control damaged?

Problem: Water leaking into room.

Troubleshooting:

1. The air humidity is excessively high. Check to see if all windows and doors are closed.
2. Call service Tech if not corrected by the above action.

Problem: Water leakage in outdoor unit.

Troubleshooting:

1. When the unit is running in Auto Defrosting mode, ice will thaw and drip into pan.
2. When the unit is running in HEAT mode, the water adhered to the condenser coil drains into pan.

Problem: Noise from indoor unit emitted.

Troubleshooting:

1. When defrosting is started or stopped, it will make a sound. This is due to the refrigerant flow reversing directions.
2. Normal refrigerant flowing in unit.

Notes: 

1. If E7 error code occurs, see the AUTO mode section in Operators Manual on page 7 .
2. An audible beep will be heard, when a button is pressed, if the remote control is communicating with the receiver.