Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

87 PB
TROUBLESHOOTING
Error code and solutions
ERROR CODE Meaning Solutions Click link for
reference
E1 Communication Error
between Power,
IPM, Main, & or
Display electronic
boards+B2:C14
Check all Communication Cables; MOD_Com, MB_Com, Display_
com& Power Relay_com.
See “Unit does
not operate” in
troubleshooting
section”
E2 Indoor Temp Sensor
Open/Shorted
Check if properly connected.
Check resistance values.
Check for loose wires/broken wires in Molex connectors.
Check
Thermistors
E3 Indoor Evaporator Coil
Sensor Open/Shorted
Check if properly connected.
Check resistance values.
Check for loose wires/broken wires in Molex connectors.
Check
Thermistors
E4 Indoor Supply Air Sen-
sor Open/Shorted or
Overheating of electric
heater
Check if properly connected.
Check resistance values.
Check for loose wires/broken wires in Molex connectors.
Check for Over Heating.
Check for low air flow or no air flow due to evap coil clog.
Evap fan motor compromised, Fan Capacitor compromised,
blower wheel compromised.
Heater relays compromised.
Check
Thermistors
Check Heater
control
E5 IPM Board in protection
mode
Check if compressor wiring is incorrect, IPM PCB comprimised,
Power PCB comprimised, or if compressor compromised.
Check for airflow obstructions.
Check CN 13 on Power PCB for 15VDC at pins 1 and 2.
Check compressor coil resistence. Check IPM PCB for arcing or
odors of overheating.
Check and monitor power supply stability and ensure proper NEC
code grounding at the main breaker and power supply.
Remove IPM PCB
(Inverter Board)
Power PCB
Identication
Compressor
Checks
Remove Power
PCB
E6 Outdoor Temp Sensor
Open/Shorted
Check if properly connected, check resistance values, check for
loose wires/broken wires in Molex connectors.
Check
Thermistors
E7 Outdoor Condenser Coil
Sensor Open/Shorted
Check if properly connected, check resistance values, check for
loose wires/broken wires in Molex connectors.
Check
Thermistors
EC Compressor attempted
to start but failed to
start
Check Dip Switch SW2 on Main Board is correct for the BTU of
the unit model.
Check Compressor wiring is properly connected.
Check compressor for Short/Ground, Check IPM Board.
See Operation
section for details
on dip switches
Compressor
Checks
EH EEPROM Error Replace Main Board, Check for compromised electrical wires to
Main Board
Replace Main
Board
EF 30 amp power cord
installed on PVH09 (230
or 265 volt) Not Allowed
Replace the power cord to 15A or 20A supply cord as required.
See Accessory section.
Replace Power
Cord
P1 Cooling or Heating
overload
Check for low air flow or no air flow due to evaporator or con-
denser coil bloked with debris.
Evap/Cond motor fan motor compromised, Fan Capacitors com-
promised, blower wheel/fan blade compromised.
Check Resistence values for indoor and Outdoor coil thermistors.
Check indor fan
motor
Check oudoor fan
motor
Check Fan
Capacitors
Check
Thermistors
Figure 712