Operation Manual

Problem display by blinker code
Display
LED in AT
Fault description Checks Remedial measures
No.
16
red
No.
17
yellow
No.
18
green
ER01 flashes - - -
Air circulation sensor on
indoor unit is defective /
triggered
Check resistance (see p. 19) Replace defective sensor
ER02 flashes - - -
Indoor unit power supply
defective
Check power supply Repair power supply
ER03 flashes - - -
Frost protection sensor on
indoor unit faulty/tripped
Check resistance (see p. 19) Replace defective sensor
ER04 flashes - - -
Vaporiser fan motor speed
too low / defective
Check fan motor, fan blade Replace motor or blade
ER05 flashes - - -
EEPROM indoor unit control
board error
ER06 flashes - - -
Communication error
between IT and AT
ER07 flashes - - -
Refrigerant fill quantity
incorrect
Check refrigerant pressure.
ER08 flashes O • •
AT condenser sensor faulty /
tripped
Check resistance (see p. 19) Replace defective sensor
ER09 flashes • O •
Communication error
between IT and AT
Check wiring and connections
ER10 flashes O O • Compressor speed too low
Check cable connections, pipe connections,
shut-off valves, compressor
ER11 flashes O • O Over-current error
Check voltage, cable connections,
refrigerant pressure, ambient conditions
ER12 flashes • O O PFC error
Check cable connections, pipe connections,
shut-off valves, compressor
ER13 flashes × • •
Inverter-control board
communication error
Check cable connections, pipe connections,
shut-off valves, compressor
ER14 flashes • • × Inverter board safety shut-off
Check cable connections, pipe connections,
shut-off valves, compressor
ER15 flashes O • ×
Indoor unit outdoor air sensor
defective
Check resistance (see p. 19) Replace defective sensor
ER16 flashes × O •
Compressor temperature too
high
Check condenser for dirt, check refrigerant
pressure Check fan
ER18 flashes × O O
EEPROM Outdoor unit
control board error
ER19 flashes × × × Compressor start error
Check cable connections, pipe connections,
shut-off valves, compressor
ER20 flashes × × • Outdoor unit system error
• × × Incorrect setting type for unit Contact specialist firm
HL O × • Power supply fault
Check voltage, cable connections,
refrigerant pressure, ambient conditions
OT × × O
Ambient temperature too
high
Switch unit off, switch unit back on when
ambient temperature is lower
OP × • O Liquid temperature too high
Check condenser for dirt, check refrigerant
pressure Check fan
OD × O ×
Hot gas temperature too high
Check condenser for dirt, check refrigerant
pressure Check fan
OH O × ×
Inverter board overheat
• = Off O = On × = flashes
REMKO ATY
18