Panasonic 2WAY Multi Technical & Service Manual page 112

● 9-1
Checking the Water Heat Exchanger Unit's Motor-Operated Valve
Standard for determining that the motor-operated valve is open:
The temperature of the water heat exchanger's coolant outlet must be
40°C or higher when 30 minutes have elapsed after reaching complete
combustion in the heating mode.
Check this by the No. 0 operation data display.
● 9-2
Switch on the power between No. 5 and No. 1-4 and between No.
10 and No. 6-9 of the water heat exchanger unit's control board
connectors 10P-1 (white) and 10P-2 (black). Then if a pulse voltage
exists, everything is normal.
(Approximately DC 4 V when measured with a tester.)
● 9-3
Disconnect the water heat exchanger unit's solenoid valve connector
6P-1 (white), and measure the motor-operated valve coil's resistance
between No. 5 and No. 1-4 with a tester. If the resistance is 0 Ω or ∞,
replace the coil.
(Approximately 46 Ω is normal.)
● 11-1
Check outdoor electric valve and backup stop valve
Check by using the following procedure to display the P20 stop data (nonvolatile memory) on the 7-segment
LED.
a. In No.1 Error data display, lightly press the set key once.
b. Select data code 1-3 using the up and down keys, and press set key for 1 second or more.
c. Use the up and down keys to change the display data to compare outdoor heat exchanger inlet temperature
(data code 16) with compressor inlet temperature (data code 14). If the outlet temperature is lower, the
outdoor solenoid valve may be locked.
IV–99
Orange
Red
Yellow
Black
Gray
Phase A Orange
Phase A' Yellow
Gray
Red Black White
Phase B Phase B'