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TROUBLESHOOTING
28) Inspect Engine Coolant Temperature Sensor
29) Inspect Radiator Cap
30) Check Engine Oil Amount
1. Check the relay connector for the engine coolant
temperature for looseness or contact failure.
2. Check for disconnection or short circuit at CN6[11]-
[12] on the main PCB and relay connector.
Resistance value Condition
∞ Disconnection
0 Ω Short circuit
3. Check engine coolant temperature by selecting
"Engine coolant temperature (code No. 51)" in the
monitor mode of the board maintenance functions.
Engine coolant
temperature
sensor
4. Measure actual temperature with a thermometer,
and check for the sensor reading's extreme devia-
tion from the actual temperature.
5. Measure the resistance value of the engine coolant
temperature sensor at CN6[11]-[12] on the main
PCB, and check for extreme deviation from the
standard value.
Temperature Standard resistance value
122 ℉ (50 ℃ ) 17.6 kΩ
176 ℉ (80 ℃ ) 6.1 kΩ
212 ℉ (100 ℃ ) 3.3 kΩ
230 ℉ (110 ℃ ) 2.5 kΩ
1. Check the gaskets are not cracked or deformed.
Gaskets
2. Confirm that the operating pressure of the radiator cap is
7.3 ± 1.5 psi (0.05 ± 0.01 MPa).
Radiator cap
Cap tester
Adapter
Check the engine oil amount with an oil level gauge
on the sub oil reservoir.
NOTE) When the outdoor unit is running or just has
stopped, wait for 5 minutes before you check
the engine oil amount.
Specified amount (sub oil reservoir)
8 TON
B level -3/8 ~ 0 inch (-10 ~ 0 mm)
7.93 gal (30 L)
15 TON
A level -3/8 ~ 0 inch (-10 ~ 0 mm)
8.45 gal (32 L)
Oil level gauge
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