Hitachi UTOPIA RAS-4HVRP2E - Page 275

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
273
10
Alarm code
14
Abnormality of Thermistor for Gas Refrigerant Pipe Temperature at Indoor Unit Heat Exchanger (Gas
Pipe Thermistor)
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
Thisalarmcodeisdisplayedwhenashortcircuit(0.24kΩorless)ordisconnection(840kΩormore)ofthethermistoris
detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed.
Phenomenon Cause
Check Item
Action (Turn OFF
Main Switch)
Failure of Thermistor
for Indoor Unit Heat
Exchanger Gas Pipe
Temp.
Failure of Indoor Unit PCB
Failure
Incorrect Connection
Check resistance
Check wiring to Indoor Unit
PCB
Replace Indoor Unit PCB
and check operation
Replace thermistor if faulty
Correctly connect wires
Replace Indoor Unit PCB if
faulty
Failure of Thermistor
Failure of Indoor Unit PCB
Is resistance of THM5
between0.24kΩand840kΩ?
Is thermistor THM5 (for gas
pipe) connected to THM5 of
indoor Unit PCB?
Yes
Yes
No
No
Connect them
Refer to “Alarm Code 11”
for thermistor resistance