Johnson Controls DHPM09NWM42Q1 Installation Manual page 26

898150-UIM-B-0113
TABLE 12: Error Codes
Indoor Character
Discharge line
E4
temperature protection
E5 Compressor over-current protection
Communication failure between
E6
indoor unit and outdoor unit
E7 Mode conflict
Compressor high
E8
temperature protection
Over tube temperature
FA
drop frequency
FC Door malfunction
Compressor overload
FE
sensor malfunction
Anti-freezing upper
FH
and lower limit range
F0 Indoor coil is gathering refrigerant
Indoor ambient sensor (RT1)
F1
open or short circuited
26
Display
Sensor RT5 monitors compressor dis-
charge line temperature and communi-
cates with outdoor unit microprocessor.
Depending on the temperature measured,
the compressor speed will be increased to
meet the load or will continue to run at the
existing speed. If the temperature
becomes excessively high, the compres-
sor will be de-energized. When the com-
pressor discharge temperature drops
below 194ºF (90ºC), the unit will resume
normal operation.
All system functions are terminated except
indoor fan.
All system functions are terminated except
indoor fan.
If the outdoor unit for example is operating
in heating mode based on demand from a
indoor unit and there is a call for cooling at
one of the other indoor zone unit. The
indoor unit will display E7.
All system functions are terminated after
three-minute delay except indoor fan.
Elevated temperature sensors readings
will adjust compressor frequency. Specific
temperature sensor values will reduce
compressor frequency.
Access door malfunction
Compressor overload sensor issue (Open
contacts). Unit will cycled OFF.
Compressor will run at reduced speed until
temperature increases.
All system functions are terminated except
indoor fan.
Cooling and dehumidification modes will
continue to operate as well as indoor fan.
Unit will not operate in heating mode.
System Status
Troubleshooting for
Possible Causes
• Check for low refrigerant charge.
• Check for restricted refrigerant flow due
to blocked capillary.
• Check for locked compressor rotor due to
excessively high ambient temperature.
• Check for restricted refrigerant flow due
to blocked capillary tubing.
• Check outdoor unit to make sure that coil
is not blocked.
• Check indoor to outdoor field wiring to
confirm (N) 1 from indoor goes to (N) 1
outdoor, terminal 2 from indoor goes to ter-
minal 2 outdoors and terminal 3 indoors
goes to terminal 3 in outdoor.
• Communications between indoor and
outdoor unit may have been cut due to the
installation of a condensate pump and
connected as illustrated in figure 46.
Normal system operation.
Refer to the ProficienTECH Ductless Splits
Technical Training Manual.
• Check for locked compressor rotor due to
excessively high ambient temperature.
• Check for restricted refrigerant flow due
to blocked capillary tubing.
• Check outdoor unit to make sure that coil
is not blocked.
Only floor standing units. Unit will cycled
OFF.
• Check for locked compressor rotor due to
excessively high ambient temperature.
• Check for restricted refrigerant flow due
to blocked capillary tubing.
• Check outdoor unit to make sure that coil
is not blocked.
Wait for temperature to increase above
42.8ºF (6ºC), then recheck operation sta-
tus.
Pump refrigerant into outdoor unit. Check
2-way shut-off valve in small line to see if it
is closed or if flow is restricted. Correct, if
necessary.
• Check sensor to ensure that it is in
acceptable range.
• Check sensor for proper resistance.
• Replace sensor if shorted, open or
out-of-calibration.
Johnson Controls Unitary Products