Haier H2SM-(9+12)HV03/R2 Service Manual page 53

D501-D504 on the main board with a multimeter. Test if there is any 5v circuit shorts at
R501-R503 and D-505. Replace device CT501.
7#. No load: Test the 4 diodes D501-D504 on the main board with a multimeter. Test is there
is any circuit short with GND at R501-R503 and D505( special focus on the possible circuit
short condition the terminal A of D502 and terminal K of D504). To test if there is any
formation of resistance or GND circuit short at the capacitor C501. Replace device CT501.
8# Overloaded/ under loaded voltage: Test if there is 310V DC between the terminal P and N
of the program module. Test if there is any circuit short at R301-R304 , R324 and R325.
Test if there is any formation of resistance or GND circuit short at the capacitor C304.
9# DC compressor start-up failure: Please restart; Check if the input and output at 7805(IC04)
is correct. Check the status of the module on the module board. (the normal reading of the
diode mode on the multimeter should be 0.45 at the P, N, U, V, W disconnect
terminals.);Check the voltage of C4,C5,C6 on the module board is 15V or not.
10#. Refrigeration overload: the temperature of pipe is too high,if the malfunction is
reported frequency, check the refrigerant is enough or not.
11# Defrosting condition: After the completion of the defrosting, the system will return to
normal.
12#. IPM protection: check if the system circuits are at normal condition. Check if there is any
GND short at R08 on the main board, to test if there is any formation of resistance or GND
circuit short at the capacitor C02, or any other protection modes caused by temporal current
surge as a result of inappropriate operation or other reasons.
13#£¬ 1 4# malfunctions: Check if the installation of IC05 on the main is correct. (if the installation
is reversed), and if there is any break at the back of the main board. Replace IC05 directly.
16# No AC power: Check the power supply.
19#DC compressor speed control failure: Restart the compressor after it is turned of for a while.
If the restart doesn't work, refer the suggestions of NO 9 and NO 4.
31# and 32# A/B system communication problem: please refer to NO 5 and check the indoor
system communication circuit.
vals can be controlled in E2.
Air Conditioner
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Edition:2006/1/10