Tadiran Telecom ANL-100, Service Manual

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8.4 Indicator lamps troubleshooting.
Lamps Status Indication Corrective Action
1 POWER flashes 10
seconds after A/C
startup (with or
without other signal
lamps). Communication problem.
Check connection between indoor and
outdoor units.
2
POWER,
COMPRES. and
PRESSURE lamps
flash. TH-1 failure. Check TH-1 for correct resistance.
Check for proper connection between
TH-1 and indoor unit.
Replace TH-1 if necessary.
3
POWER,
COMPRES. and
IMPEDANCE
lamps flash. TH-2 failure. Check TH-2 for correct resistance.
Check for proper connection between
TH-2 and indoor unit.
Replace TH-2 if necessary.
4
POWER lamp
flashes and
PRESSURE is lit,
AIR CON is OFF. Low Pressure. Check if the filters are clean.
Check TH-1 & TH-2 for correct resistance.
Check cooling system for normal
operation.
5
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.
6
FILTER is lit Filter cleaning. Clean all filters.
7
POWER &
IMPEDANCE
lamps flash,
COMPRES. Is lit. Low voltage. Check power supply voltage.
Check electrical connections.
Replace TAC-444.
8
POWER lamp
flashes,
IMPEDANCE &
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.