Possible causes of troubles
¥Thermistor failure
:Operation
lamp
: Timer lamp
:Heat stand-
by lamp
Indoor thermistor is either
open or short.
Outdoor thermistor is either
open or short.
Indoor coil temp. (E1 = TH2) cannot be detected.
Indoor coil temp. (E2 = TH3) cannot be detected.
Indoor room temperature cannot be detected.
Outdoor coil liquid temp. (C1 = TH0E) cannot be detected.
Outdoor coil gas temp. (C2 = TH0C) cannot be detected.
:Operation
lamp
: Timer lamp
:Heat stand-
by lamp
Protective device for
compressor is activated.
PC compressor motor is overloaded.
PC compressor motor is locked.
Compressor current detection circuit is defective.
Low-pressure protector is activated.
(Low pressure switch or low pressure prevention.)
Standard comp. contactor (Mg SW)is chattering.
F01
F02
F10
F04
F06
F07
H01
H02
H03
H06
H18
¥Fault with
compressor
and its circuit
:flashes
: OFF
29
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