Product data

TROUBLESHOOTING
Table 6 – Indicator Lamps Troubleshooting
LAMP STATUS INDICATION CORRECTIVE ACTION
POWER flashes 10 seconds
after A/C start-up (with or
without other signal lamps)
Communication problem
•
Check connection between indoor
(TAC-440) and outdoor (TAC-420)
units (for TAC-400, ANC)
•
Check connection between TAC-
444 and TAC-460 (for TAC-404)
POWER, COMPRES, and
PRESSURE lamps flash.
Thermistor failure
•
Check TH-1 for correct resistance
•
Check for proper connection
between TH-1 and TAC-444
•
Replace TH-1 if necessary
POWER, COMPRES, and
IMPEDANCE lamps flash
Thermistor failure
•
CHECK TH-2 for correct resistance
•
Check for proper connection
between TH-2 and TAC-444
•
Replace TH-2 if necessary
POWER lamp flashes and
PRESSURE is lit, AIR CON is
Off
Low Pressure
•
Check if the filters are clean
•
Check TH-1 and TH-2 for correct
resistance
•
Check cooling system for normal
operation
POWER AND PRESSURE
lamps flash, AIR CON is Off
High Pressure
•
In Heat mode: Check if the
evaporator is blocked (Check if
filters are clean)
•
Check TH-2 (in Heating mode) or
TH-3 (in Cool mode) for correct
resistance
•
Check cooling system for normal
operation
FILTER is lit
Filter cleaning
•
Clean all filters
POWER, IMPEDANCE lamps
flash, COMPRES is lit
Low voltage
•
Check power supply voltage
•
Check electrical connections
•
Replace TAC-444
POWER lamp flashes,
IMPEDANCE and COMPRES
lamps lit, AIR CON lamp
flashes after A/C startup
Voltage failure at startup
•
Check power supply voltage
•
Check electrical connections
•
Replace TAC-444
POWER lamp flashes,
IMPEDANCE and COMPRES
are lit before A/C startup
High voltage
•
Check power supply voltage
•
Check electrical connections
•
Replace TAC-444
POWER lamp flashes,
IMPEDANCE and COMPRES
are lit, AIR CON is lit after A/C
startup
High voltage during compressor
operation
•
Check power supply voltage
•
Check electrical connections
•
Replace TAC-444
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