![background image](http://html1.mh-extra.com/html/carrier/30gt080-420/30gt080-420_installation-start-up-and-service-instructions-manual_2562301048.webp)
Table 8 — Quick Test
(cont)
SECTION B. — Thermistor and Potentiometer Checkout
QUICK TEST
STEP NO.
NORMAL
DISPLAY
STEP DESCRIPTION
THERMISTOR
OR
POTENTIOMETER
— Thermistor OK
T1 — Cooler Leaving Fluid
Thermistor
— Thermistor Faulty
— Thermistor OK
T2 — Cooler Entering Fluid
Thermistor
— Thermistor Faulty
— Thermistor OK
T3 — Saturated Condensing
Thermistor, Circuit A
— Thermistor Faulty
— Thermistor OK
T4 — Saturated Condensing
Thermistor, Circuit B
— Thermistor Faulty
— Thermistor OK
†
T5 — Cooler Thermistor,
Circuit A (EXV Units)
— Thermistor Faulty or Not Used
— Thermistor OK
†
T6 — Cooler Thermistor,
Circuit B (EXV Units)
— Thermistor Faulty or Not Used
— Thermistor OK
†
T7 — Compressor Thermistor,
Circuit A ( EXV Units)
— Thermistor Faulty or Not Used
— Thermistor OK
†
T8 — Compressor Thermistor,
Circuit B (EXV Units)
— Thermistor Faulty or Not Used
— Thermistor OK
T10 — Accessory Remote
Thermistor
— Thermistor Faulty or Not Used
— Potentiometer OK
P1 — Leaving Fluid Set Point
Potentiometer
— Potentiometer Faulty
No Significance
—
— Potentiometer OK
P3 — Accessory Reset
Limit Potentiometer
— Potentiometer Faulty or Option Not Used
— Potentiometer(s) OK
P4 — Accessory Demand
Limit Potentiometer(s)
— Potentiometer(s) Faulty or Option Not Used
— Potentiometer OK
P5 — Accessory Reset
Ratio Potentiometer
— Potentiometer Faulty or Option Not Used
— Potentiometer OK
P6 — Accessory Reset Set
Point Potentiometer
— Potentiometer Faulty or Option Not Used
NOTE: See legend and notes on page 49.
48