Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

81 PB
COMPONENT TESTING
Check Indoor Fan Motor
Indoor fan control in cooling mode:
The indoor fan will run synchronously with cooling
demand. During no demand period if the CONSTANT
FAN button is turned off, it will run for 30s and then
turn off. When CONSTANT FAN is ON, it will always be
running.
1) Check voltage between Nuetral and High, medium, or
low.
Voltages should be 7-9vdc
If no voltage is present check cable and resistance
values on motor.
2) Check for continuity between pins on fan plug
connector.
N-H = 65.4 ohms +- 10%
N-L = 126.6 ohms +- 10%
Outdoor fan control in cooling mode:
The outdoor fan has two speeds, low and high. When T4
is above 80°F, the fan operates in high speed.
When T4 drops to 77°F the fan operates in low speed.
1) Check voltage between Nuetral and High, or low.
Voltages should be 7-9vdc.
If no voltage is present check cable and resistance
values on motor.
2) Check for continuity between pins on fan plug
connector.
N-H = 189.6 ohms +-10%
N-M = 216.2 ohms+-10%
N-L = 240.6 ohms +-10%
Check Outdoor Fan Motor
Indoor Fan (H)
High Speed
Indoor Fan (M)
Medium Speed
Indoor Fan (L)
Low Speed
Indoor Fan (N)
Nuetral
Outdoor Fan (N)
Nuetral
Outdoor Fan (L)
Low Speed
Outdoor Fan (H)
High Speed
Figure 706 (Check Indoor and outdoor Fans)
For full view of Power PCB (Power Board) and connections
view Figure 7xx
Gain Access to the Power PCB (Power Board).
1. Remove front panel (Figure 501).
2. Remove User Interface (Figures 502 thru 504).
3. Open electrical Control Box (Figure 505).
Figure 707 (Check Indoor and outdoor Fans)