TGM FOREST ON/OFF Series User manual

FORESTONOFF SERIES
SERVICE MANUAL

Contents
1. Safety Caution .......................................................................................................2
2. General Troubleshooting ......................................................................................3
3. Complain Record Form ..........................................................................................4
4. Information Inquiry ...............................................................................................6
5. Error Diagnosis and Troubleshooting Without Error Code.................................7
5.1 Remote maintenance.....................................................................................7
5.2 Field maintenance .........................................................................................8
6. Quick Maintenance by Error Code........................................................................9
7. Troubleshooting by Error Code...........................................................................14
7.1 EH 00 (EEPROM parameter error diagnosis and solution) .............................14
7.2 EL 01 (Indoor and outdoor unit communication diagnosis and solution).......15
7.3 EH 02 (Zero-crossing detection error diagnosis and solution)........................17
7.4 EH 03/F5/EC 07 (Fan speed is operating outside of the normal range diagnosis
and solution) ...............................................................................................18
7.5 EH 60/EH 61/EC 52 (Open circuit or short circuit of temperature sensor diagnosis
and solution) ...............................................................................................21
7.6 EH 0b (Indoor PCB/display board communication error diagnosis and solution)22
7.7 EL 0C (Refrigerant leakage detection diagnosis and solution) .......................23
7.8 PC 03 (High pressure protection) .................................................................24
8. Check Procedures.................................................................................................25
Troubleshooting

Troubleshooting 2 
1. Safety Caution
WARNING
Be sure to turn off all power supplies or disconnect all wires to avoid electric shock.
While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist
strap to avoid damage to the board.
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
Test the voltage between the two pins of the compressor capacitor. If the voltage is zero, the capacitors are fully
discharged.
Note: This picture is for reference only. Actual appearance may vary.

Troubleshooting 3 
2. General Troubleshooting
2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer
lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following
tables:
Operation
Lamp
Timer
Lamp Display Error Information Solution
1 time OFF Eh 00 Indoor unit EEPROM parameter error TS14
2 times OFF EL 01 Indoor / outdoor unit communication error(for some models) TS15
3 times OFF EH 02 Zero-crossing signal detection error TS17
4 times OFF EH 03 The indoor fan speed is operating outside of the normal range TS18
6 times OFF EH 60 Indoor room temperature sensor T1 is in open circuit or has short
circuited TS21
6 times OFF EH 61 Evaporator coil temperature sensor T2 is in open circuit or has short
circuited TS21
9 times OFF EH 0 Communication error between display board and main board TS22
8 times OFF EL 0C Refrigerant leak detected TS23
5 times OFF EC 52 Condenser coil temperature sensor T3 or Outdoor room temperature
sensor T4 is in open circuit or has short circuited(for some models) TS21
12 times OFF EC 07 The outdoor fan speed is operating outside of the normal range (for
some models) TS18
7 times FLASH PC 03 High pressure protection(for some models) TS24
For other errors:
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a
temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.
If the unit responds, the display board requires replacement.

Troubleshooting 4 
3. Complain Record Form
Complain Record Form
Request No.: Date:
Installation Date: Service Date:
Customer Information
Name Telephone No.
Home Address
Email
Product Information
Indoor Unit Model Outdoor Unit Model
Serial No. of indoor unit
Serial No. of outdoor unit
Working Mode □Cooling □Heating □Fan only □Dry
Setting temperature °C / °F Fan speed □Turbo □High □Medium □Low
□Auto
Temperature of air inlet °C / °F Temperature of air
outlet °C / °F
Installation / Condition Information
Indoor temperature °C / °F Indoor humidity %RH
Outdoor temperature °C / °F Outdoor humidity %RH
Length of Connecting pipe Pipe diameter Gas pipe: Liquid pipe:
Length of Wiring wire diameter
System Running Pressure MPa or Bar or PSI
Room size (L*W*H)
Photo of Installation of In-
door unit
(Photo #1)
Photo of Installation
of Outdoor unit
(Photo #2)
Failure Description
Error Code of Indoor unit Code of Outdoor
PCB
Unit does not start
Remote control does not work
Indoor display shows nothing
No cooling or heating at all
Less cooling or heating
Unit starts but stops shortly
High noise
High vibration

Troubleshooting 5 
Parameter Checking information by Remote controller
Displaying code Displaying code meaning Display value Display value meaning
T1 Room temperature
T2 Indoor coil temperature
T3 Outdoor coil temperature
Approval from Manufacturer
□Approved
□More Proof needed
□Rejected

Troubleshooting 6 
4. Information Inquiry
• To enter information inquiry status, complete the following procedure within ten seconds:
• Press LED(or DO NOT DISTURB) 3 times.
• Press SWING(or AIR DIRECTION) 3 times.
• Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter
checking mode.
• Use the LED(or DO NOT DISTURB) and SWING(or AIR DIRECTION) buttons to cycle through information displayed.
• Pressing LED(or DO NOT DISTURB) will display the next code in the sequence. Pressing SWING(or AIR DIRECTION) will
show the previous.
• The following table shows information codes. The screen will display this code for two seconds, then the information
for 25 seconds.
Displayed code Explanation Displayed
value Meaning Additional Notes
T1 Room temperature
-14—70 -14—70
1. All displayed temperatures
use actual values.
2. All temperatures are
displayed in °C regardless
of remote used.
3. If the actual value exceeds
the range, it will display
the maximum value or
minimum value.
T2 Indoor coil
temperature
T3 Outdoor coil
temperature

Troubleshooting 7 
5. Error Diagnosis and Troubleshooting Without Error Code
WARNING
Be sure to turn off unit before any maintenance to prevent damage or injury.
5.1 Remote maintenance
SUGGESTION: When troubles occur, please check the following points with customers before field maintenance.
No. Problem Solution
1 Unit will not start TS10 - TS11
2 The power switch is on but fans will not start TS10 - TS11
3 The temperature on the display board cannot be set TS10 - TS11
4 Unit is on but the wind is not cold(hot) TS10 - TS11
5 Unit runs, but shortly stops TS10 - TS11
6 The unit starts up and stops frequently TS10 - TS11
7 Unit runs continuously but insufficient cooling(heating) TS10 - TS11
8 Cool can not change to heat TS10 - TS11
9 Unit is noisy TS10 - TS11

Troubleshooting 8 
5.2 Field maintenance
Problem Solution
1 Unit will not start TS12 - TS13
2 Compressor will not start but fans run TS12 - TS13
3 Compressor and condenser (outdoor) fan will not start TS12 - TS13
4Evaporator (indoor) fan will not start TS12 - TS13
5 Condenser (Outdoor) fan will not start TS12 - TS13
6 Unit runs, but shortly stops TS12 - TS13
7 Compressor short-cycles due to overload TS12 - TS13
8 High discharge pressure TS12 - TS13
9 Low discharge pressure TS12 - TS13
10 High suction pressure TS12 - TS13
11 Low suction pressure TS12 - TS13
12 Unit runs continuously but insufficient cooling TS12 - TS13
13 Too cool TS12 - TS13
14 Compressor is noisy TS12 - TS13
15 Horizontal louver can not revolve TS12 - TS13