Lennox MWCB Series Service Manual

4
2. General Troubleshooting
2.1. Error Codes
When the indoor unit encounters detects an error condition the running LED with ash in a corresponding series, the timer
LED may turn on or begin ashing and display the error code. These error codes are described in the following tables:
Table 1. Indoor Display Alert and Status Codes and Outdoor Unit LED
Unit Error Codes
Outdoor Unit Main
Control Board
Indoor Unit
Display
Solution
MCB MWCB
System Error Codes
Indoor unit EEPROM error
n/a EH 00
See “4.1. TS01-IDU” on
page 8.
Indoor unit EEPROM parameter error
n/a EH 0A
Communication error between indoor unit and outdoor units
n/a EL 01
See “4.3. TS02-S-INV” on
page 9.
Indoor fan speed error (DC motor)
n/a EH 03
See “4.4. TS04-S-IDU” on
page 10.
Indoor room temperature sensor error (T1)
n/a EH 60
See “4.6. TS05-IDU” on
page 14.
Indoor coil temperature sensor error (T2)
n/a EH 61
Refrigerant leakage detection (Cooling mode only)
n/a EL 0C
See “4.8. TS06-INV” on
page 16.
Outdoor current overload protection
n/a PC 08
See “4.10. TS08-S” on page
17.
Outdoor ambient temperature sensor error (T4)
n/a EC 53
See “4.7. TS05-ODU” on
page 15.
Outdoor coil temperature sensor error (T3)
n/a EC 52
Compressor discharge temperature sensor error (TP)
n/a EC 54
Outdoor unit EEPROM error
n/a EC 51
See “4.2. TS01-ODU” on
page 8.
Outdoor unit fan speed error (DC fan motor)
n/a EC 07
See “4.5. TS04-S-ODU” on
page 13.
Inverter module IPM error
n/a PC 00
See “4.11. TS09-S” on page
18.
High or Low voltage protection
n/a PC 01
See “4.12. TS10-S” on page
19.
Compressor drive error
n/a PC 04
See “4.13. TS12-S” on page
20.
Standby
SLOW FLASH n/a
Normal operation
LIT n/a
Outdoor unit error
FAST FLASH n/a
Communication error between main control board and display board
n/a EH 0b
See “4.9. TS07” on page
16.
Operational Status Codes
46F heat mode (Heat pumps models only)
n/a FP
Force Cooling
n/a FC
Remote or Wired controller Lock
n/a LL
Defrost (Heat pumps models only)
n/a dF
Active clean
n/a CL
Time On
n/a On
Time Off
n/a OF
Anti-cold Air Flow (Heat pumps models only)
n/a cF
Remote On/Off
n/a CP
ECO mode
n/a
On display 3
seconds
Outdoor Unit LED:
Slow ash: Flashing at 1Hz
Fast ash: Flashing at 2Hz

Lennox MWCB Series Specifications

General

Brand	Lennox
Model	MWCB Series
Category	Air Conditioner
Language	English