Carrier 42NQV025H Service Manual page 84

(3) Check procedures
(42NQV025H, 42NQV035H, 42NQV035M)
No. Procedure
1 Turn off the power supply breaker
and remove the P.C. board
assembly from electronic parts
base. Remove the connecting
cables from the terminal block.
2 Remove the connector of the
motor and turn on the power
supply breaker. If OPERATION
indicator flashes (once per
second), it is not necessary to
check steps (1 to 3) in the right
next column.
3 Push [START/STOP] button once
to start the unit. (Do not set the
mode to On-Timer operation.)
4 Shorten the restart delay timer
and start unit.
Push [START/STOP] button once
5
to start the unit,
• Shorten the restart delay timer.
• Set the operation mode to
COOL.
• Set the fan speed level to
AUTO.
• Set the preset temperature
much lower than the room
temperature. (The unit (com-
pressor) operates continuously
in the above condition.)
6
If the above condition (No. 5) still
continues, start the unit in the
following condition.
• Set the operation mode to
HEAT.
• Set the preset temperature
much higher than room tem-
perature.
Table 11-8-1
Check points
Check whether or not the fuse (F01)
is blown.
Check power supply voltage :
1. Between No. 1 and No. 3 of CN01
(AC 220–240V)
2. Between and of C03
(DC 310–340V)
3. Between 12V and GND
4. Between 5V and GND
Check power supply voltage :
1. Between CN51 and
No. 1 of CN01 (DC 15–60V)
Check whether or not all indicators
(OPERATION, TIMER, FAN-ONLY,
FILTER, HI-POWER) for 42NQV035M
and (OPERATION, TIMER,
FAN-ONLY,
FILTER, HI-POWER,
NIGHT-LIGHT, 7-SEGMENT)
for 42NQV025H, 42NQV035H
are lit for 3 seconds and they
return to normal 3 seconds later.
1. Check whether or not the com-
pressor operates.
2. Check whether or not the OP-
ERATION indicator flashes.
1. Check whether or not the com-
pressor operates.
2. Check whether or not the OP-
ERATION indicator flashes.
– 84 –
FILE NO. SVM-07013
Causes
Impulse voltage was applied or the
indoor fan motor short-circuited.
1. The terminal block or the crossover
cable is connected wrongly.
2. The capacitor (C01), line filter
(L01), resistor (R02), or the diode
(D01, D02, D03, D04) is defective.
3. T101 is defective.
4. IC12 and T101 are defective.
IC51 and IC52 are defective.
The indicators are defective or the
housing assembly (CN21) is defective.
1. The temperature of the indoor heat
exchanger is extremely low.
2. The connection of the heat ex-
changer sensor is loose.
(The connector is disconnected.)
(CN62)
3. The heat exchanger sensor and the
P .C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective.
1. The temperature of the indoor heat
exchanger is extremely high.
2. The connection of the heat ex-
changer sensor short-circuited.
(CN62)
3. The heat exchanger sensor and the
P .C. board are defective.
(Refer to Table 11-4-1.)
4. The main P.C. board is defective