Failure
Type/
Location
Run
LED
Alarm
LED-
Number of
Flashes
Fault Condition
Description
Indoors
Off
1
Dirty fi lter
Clean fi lter,press warning/clear fi lter button
Off
2
Drain pan condensate fault
Condensate, check for drain blockage or pump failure
Off
3
EPROM failure
Check indoor EPROM
Off
4
Failure for ambient temperature
detection
Check ambient temperature sensor
Off
5
Failure for coil temperature detection
Check coil temperature sensor
Off
6
Communication failure between indoor/
outdoor
Check for loose/broken connection, check transformer
Outdoor
On
1
Failure for EPROM
EPROM check outdoor EPROM
On
2
IPM Protection (component on
heatsink)
Replace heatsink
On
3
Over-current protection
Current exceeds maximum level or module failure. Check
On
4
Outdoor control communication failure
Check OD control wires and connectors
On
5
Compressor overload protection
Module failure, replace
On
6
Voltage too high or low
Incoming voltage too high/low
On
7
Compressor blocked/stopped
Module failure, replace
On
8
Discharge temperature too high
Discharge temperature too high, check system air fl ow
On
10
Condenser coil temperature too high
or low
Check system air fl ow and sensor
On
11
Suction temperature too high or low
Check system air fl ow and module
On
12
Outdoors ambient temperature too
high or low
Check outdoor ambient temperature sensor
On
13
Discharge temperature fault too high
or low
Failure for sensor or circuit detection
On
15
Communication failure (indoor or
outdoor)
Check wires, connectors, transformer
On
18
Compressor position lost, unknown
Module failure, replace
On
19
Compressor position check failure
Module failure, replace
On
20
Indoor coil temperature too high
Indoor coil temp too high in heating or module failure
On
21
Evaporator coil freeze
Indoor coil temp too low in cooling or module failure
On
22
High pressure switch open
Check, reset high pressure switch
On
24
Compressor-over current protection
Module failure, replace
On
25
Phase over-current protection
Phase over-current for compressor. Failure of sampling
On
26
Module reset
Module fault. Reset incoming fi eld power
Table 8 CAHV Microprocessor Controller Fault Indications
CAHV CONTROLLER FAULT CONDITIONS
1. Indoor fault - warning LED fl ashes 1-6, other LED's off.
2. Outdoor fault, outdoor LED fl ashes 1-26 times. Indoor run LED turns on and indoor warning LED fl ashes 1-26 times.
3. EEPROM failure on indoor unit, all 4 lights fl ash.
41
