Panasonic R410A service manual Table of Thermistor Characteristics, Service procedures, Check Pin

4. Service procedures

Check Pin

Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control described below.

1.Thermistor checks

The checks listed below are performed for 1 second each, in order from the top down. The results are displayed by LED 1 and 2.

Thermistor		Check results
	Normal		Abnormal
Discharge temp. (TD)	LED 1 lit
Outdoor air temp. (TO)	LED 2 lit
Heat exchanger temp. (C1)	LED 1 lit		LED 1 and 2 OFF
Heat exchanger temp. (C2)
Intake temp. (TS)	LED 1 lit

2.4-way valve turns ON for 1 second.

3.Forced cooling (or heating) operation

4-4. Table of Thermistor Characteristics

(1) Outdoor Air Temp. (TO), Intake Temp. (TS), Heat	(2) Discharge Temp. (TD) Sensors
Exchanger Temp. (C1) Sensor, Heat Exchanger
Temp. (C2) Sensor
Resistance (kΩ)	Resistance (kΩ)

4

Temperature (˚F)

Temperature (°F)

4-14