Internal Component Replacement (Inside Front Enclosure)
10-34 Service Manual
4. Dispose of the Power PCBA as required by WEEE Directive.
5. Position the new Power PCBA on the four mounting bosses, with the P101 con-
nector toward the UI PCBA (Figure 10-25 on page 10-33).
6. Attach the Power PCBA to the mounting bosses with the four screws. Tighten the
screws to 1.1 to 1.5 N-m (9.7 to 13.3 lb-in).
7. Connect the cables to the new Power PCBA as follows (Figure 10-25 on
page 10-33):
a. Connect the heater cable to the 5-pin P114 connector. Make sure that the
connector is oriented as shown in Figure 10-25, and that it is fully seated.
b. Connect the thermostat cable to the 2-pin P113 connector. Make sure that
the connector is oriented as shown in Figure 10-25, and that it is fully seated.
c. Connect the fan cable to the 4-pin P111 connector. Make sure the connector
latch engages.
d. Connect the thermistor cable to the 2-pin P108 connector. Make sure the
connector latch engages.
e. Connect the ribbon cable from the UI PCBA to the P101 connector. Make sure
the locking ears close completely on the connector.
f. Connect the speaker cable to the 2-pin P103 connector. Make sure the con-
nector latch engages.
g. Connect the power supply output cable to the 4-pin P109 connector. Make
sure the connector latch engages.
h. Connect the AC power inlet wire assembly to the 6-pin P112 connector. Make
sure that the connector is oriented as shown in Figure 10-25, and that it is fully
seated.
8. Follow the procedure Rejoining the Front and Rear Enclosures on page 9-5.
9. Perform the following tests:
a. Power-On Test on page 7-3.
b. Temperature Accuracy Test on page 7-8.
c. Flow Test on page 7-10.
d. Thermostat Test on page 7-11.
e. Electrical Safety Tests on page 7-14.
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