Lennox MCFA Series User Manual

8
Table 2. Troubleshooting Error Codes
Type
Indoor Unit Display
Programmable
Wired
Controller
Indoor Unit Error Codes Description
M22A, MMDB,
MCFA, MCFB,
MFMA
M33C, MWMC,
3WMC
Optional on
most Lennox
Indoor Units
Error
E8
Indoor fan motor zero-crossing signal detection error (AC motor)
Error
F0 PC 08 EA
Outdoor current overload protection
Error
F0
Communication error between wired controller and indoor unit
F1 EC 53 E5
Outdoor ambient temperature sensor error (T4)
Error
F1
The cassette panel is abnormal
Error
F2 EC 52 E5
Outdoor coil temperature sensor error (T3)
Error
F3 EC 54 E5
Compressor discharge temperature sensor error (T5)
Error
F4 EC 51 Ed
Outdoor unit EEPROM error
Error
F5 EC 07 Ed
Outdoor unit fan speed error (DC fan motor)
Error
F6 E4
Indoor coil outlet temperature sensor error (T2B)
Error
EC 56
Indoor unit #1 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #2 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #3 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #4 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #5 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #6 coil outlet temperature sensor error (T2B for multi-zone)
Error
EH 0A E7
Indoor unit EEPROM parameter error
Error
EH 0b
Communication error between main control board and display board
Error
P0 PC 00
Inverter module IPM error
Error
P1 PC 01
High or Low voltage protection
Error
P2 PC 02
High temperature sensed at compressor top
Error
P3 PC 0L
Outdoor low ambient temperature protection
Error
P4 PC 04
Compressor drive error
Error
P6
PC 03
High pressure switch open
Error
P6
Low pressure switch open
Error
P7 EF
Outdoor IGBT temperature sensor error
Self Clean Feature
For units that use the provided wireless remote control,
there is a button labeled “self clean”. Press to activate self
cleaning mode. In cooling or dry mode only, the indoor
unit will temporarily change operation to allow condensate
on the indoor unit coil to evaporate, and then will turn off.
During this operation, code SC will display on the indoor
unit.
The sequence of operation for the self-clean function is
illustrated below.
Figure 9. Self Clean

Lennox MCFA Series Specifications

General

Brand	Lennox
Model	MCFA Series
Category	Air Conditioner
Language	English