12-2-1. Malfunction in Power Supply
➀Check if operation selector of the indoor unit is set to ON. If it is not, set the switch to ON.
➁Check if the circuit breaker is disengaged or if electricity is not being supplied properly.
Normal
AC 104 – 126 V
*Use a circuit tester (set to AC range).
In case of abnormality ➞ Check power source
No abnormalities, proceed to
12-2-2. Abnormalities in Power Transformer
➀Check voltage on the secondary core side.
Measure voltage 2P connector of TRANS 2 (without disconnecting connectors).
Normal
TRANS 2
BRN – BRN
AC 12 – 18 V
*Use a circuit tester (set to AC range).
Caution: Care should be taken that the tips of the tester rods do not touch each other since the circuit is electrically charged.
In case of abnormality ➞ Replace the power transformer.
If the operation lamp continues to blink more than 3 minutes, check for the following possible causes in this order:
(1)Incorrect Wiring of
(2)Thermistor Abnormality (Indoor Unit Only)
(3)Protective Circuit of Outdoor (Burner) Unit Operated (during heating operation only)
(4)CT Detection
(5)Indoor Fan is Defective
(6)Power Circuit Wiring Error
(7)Outdoor Unit Power Supply Failure
(8)Outdoor Unit Power Transformer Defective
(9)Outdoor Unit Compressor Motor Overload Relay Has Operated
(10)Outdoor Unit Compressor Motor Defective
12-3-1. Incorrect Wiring of Inter-unit Wiring
If the blinking of the operation lamp occurs upon initial operation following installation work, incorrect wiring of
Caution: Be sure to turn off the circuit breaker switch before carrying out the wiring work.
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