LED-displayed fault codes - HMH72B24/HMH72B36
Fault codes are displayed by LED lamps on the outdoor
main control board (DC - inverter unitary). Remove the
system top cover to expose the indicator LED lamps.
There are three LED lamps on the main control board:
• LED1 indicates the fault code represented by a two-
digit number.
• LED2 indicates the fault code represented by a
single-digit number.
• LED3 indicates an outdoor drive control fault.
When LED3 is off, LED1 and LED 2 indicate the main
control fault code.
When LED3 is on, LED1 and LED 2 indicate the drive
control fault code.
When LED3 is flashing, and LED1 and LED 2 are both off, it
indicates the compressor is preheating.
Failures display with 5-s intervals. This means the LED is
off for 5 s to report the next fault code.
The system protection code display method is the same as
the main control fault code.
LED lamps are off when there is no failure, protection, or
preheating.
Figure 40: LED lamps
Figure 41: Example - outdoor main control fault 32
Figure 42: Example - outdoor drive fault 32
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump 47
Johnson Controls Ducted Systems
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