Panasonic CS-ME7DKEG Service Manual page 90

CS-ME7DKEG CS-ME10DD3EG / CS-ME10DTEG CS-E15DB4EW
Symbol Diagnosis
H30 Outdoor discharge
pipe temp. sensor
H32 Outdoor heat
exchanger temp.
sensor 2
(discharge pipe temp.)
H34 Outdoor heatsink
temp. sensor
H35 Drainage or drain
pump abnormality
H36 Outdoor gas pipe
temp. sensor
H37 Outdoor liquid pipe
temp. sensor
H39 Abnormal indoor
operating unit or
standby units
H41 Abnormal wiring or
piping connection
H97 Outdoor fan motor
mechanism lock
H98 Indoor high pressure
protection
Disconnected discharge sensor
• • • • When the condition temperature is higher than the discharge temperature + (plus) 6°C, a sensor
disconnection is detected, operation stops, and the trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
This trouble display appears when a temperature of under approximately -60°C or over approximately 110°C has
been detected continuously for 2 to 5 seconds by the outlet temperature sensor of the heat exchanger.
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
This trouble display appears when a temperature of under -43°C or above 80°C has been detected by the outdoor
unit radiator fin sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
This error appears if the float switch is open three rimes for 10 seconds or more during a twenty-minute period.
<Diagnosis checkpoint>
1. Drain blockage
2. Check the conductivity of float switch.
3. Check that the resistance of the drain motor is about 200 ohms.
This trouble display appears when a temperature of under -45°C or above approximately 149°C has been
detected by the outdoor unit gas side pipe temperature sensor continuously for 2 to 5 seconds.
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
This trouble display appears when a temperature of under -45°C or above 149°C has been detected by the
outdoor unit liquid side pipe temperature sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
This display appears in rooms other than one in which indoor freezing trouble has occurred when the pipes have
been connected incorrectly, when an outdoor expansion valve is defective or when an expansion valve connector
has become disconnected.
CU-2E only
This display appears when this kind of trouble is detected 3 minutes after a forced cooing operation was
conducted for one room during the initial operation after the power was turned on. It appears when:
• • • • The indoor unit pipe temperature in a room without the capacity supply available at an outside air temperature
above 5°C has dropped by more than 20°C to 5°C or lower 3 minutes after the compressor started up.
• • • • The outdoor unit gas pipe temperature in a room without the capacity supply available has dropped by more
than 5°C to 5°C or lower 3 minutes after the compressor started up.
When the fan motor speed detected when its maximum output is demanded is below 30 rpm. continuously for 15
seconds, the fan motor stops for 3 minutes and then restarted.
When this happens on 16 occasions (the trouble display is cleared when the value is normal for 5 minutes), the
H97 diagnostic symbol is stored in the memory, and the fan motor stops.
<Diagnosis checkpoint>
1. Check the nature of the fan lockup trouble.
2. Check for disconnections of the fan motor connectors and for defects in contact, in the fan motor and in the
control P.C. Board.
The restriction on the compressor frequency is started when the temperature of the indoor unit heat exchanger
source is between 50°C and 52°C, the compressor stops at a temperature from 62°C to 65°C, it is restarted 3
minutes later at below 62°C to 65°C, and the restriction on the compressor frequency is released at a temperature
between 48°C and 50°C. (No trouble display appears.)
<Diagnosis checkpoint>
1. Check the indoor unit heat exchanger temperature sensor (check for changes in its characteristics and check
its resistance): Symptoms include no hot start when operation is started, a failure of the thermostat to turn on
(no outdoor unit operation). And, frequent repetition of stopping and startup.
2. Check also for short-circuits indoors and clogging of the air filters.
Diagnosis method
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