Haier HSU12VHG-B Service Manual page 30

5.2.5.6 The frequency limitation of modification rate
In the field which is controlled by high frequency, if the modification rate is not high enough, the
control-driven chip will enter into weak magnetic control, this will help to relieve the problem of
modification rate. If during the course of weak magnetic control, the modification rate is still not high
enough, enter into the control of decreasing frequency until the alarm of modification rate is relieved.
5.2.5.7 Temperature protection of the outdoor refrigerating coil
When the defrosting temperature and the sensor's temperature are higher than 65 , the frequency of
the compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowest
frequency. When the temperatures are lower than 65
the compressor. When the temperatures are lower than 60 , relieve the defrosting temperature
protection.
5.2.5.8 Malfunction display and malfunction handling
a) For the complete appliance's malfunctions
If there's malfunction with the outdoor unit, the light of the outdoor unit will flash and its frequency is
1HZ, the number of times is according to the table, when a round of flashing is finished, the light
shoud be off for 5 seconds.
b) For the units' malfunctins Annex 1
If there's malfunction with the units, this will not affect the run of the complete appliance, but this can
be displayed by the malfunction light, the light flashing frequency is 0.5HZ, the number of times is
according to the malfunction table of the indoor units. When a round of flashing is finished, the light
shoud be off for 10 seconds. Then report according to the order : unit A unit B unit C unit D, that
is, if there's malfunction with several units, then just report the indoor unit with the highest priority level.
Among the unit malfunctions, the priority level of the communication malfunction is the highest, for
others, that appears first will have the priority.
Remarks: in 3 minutes when the compressor stops, the units' malfunctions are not displayed; the
complete appliance's malfunctions are prior to the units' malfunctions.
Annex 1 Malfunction codes of the whole unit
Remarks: under the mode of refrigeration, the malfunctions of each unit's thin pipe temperature
sensor are not reported, under the mode of heating, the malfunctions of each unit's thick pipe
temperature sensor are not reported.
Indoor
displaying
panel code
indication
F12
F1
F22
F3
F19
F4
F21
F6
F25
E7
F11
HSU129HG(DB)-SM
Outdoor
(LED1 flash
fault description
times)
1 Outdoor EEPROM error
2 The protection of IPM
3
Overcurrent protection of AC electricity for the outdoor model
4 Communication fault between the IPM and outdoor PCB
6 Power voltage is too high or low
8 Overheat protection for exhaust temperature
10 Frost-removing temperature sensor failure
12 Ambient temperature sensor failure
13 Exhaust temperature sensor failure
15 Communication fault between indoor and outdoor units
18 deviate from the normal for the compressor
and higher than 60 , keep the frequency of
27
Wiring Diagrams
Domestic Air Conditioner