Lennox 59K21 / LB-90403A AHC1-2 Control Board

Specifications

Catalog Number: 59K21
Part Number: LB-90403A
Control: AHC1-2
Brand: Lennox
Product Type: HVAC Control Board
Length: 5-1/2"
Width: 8-1/4"
Application: Select Lennox, Armstrong, Allied, Concord and Ducane HVAC Equipment
OEM Replacement: Yes

Replaces

68K99
70J10
70J1001
LB-90847A
LB-90403A

Lennox 59K21 / LB-90403A Control Board

The Lennox 59K21 / LB-90403A AHC1-2 control board is used in select Lennox and Allied HVAC equipment. The board receives operating signals and controls equipment functions according to the system's operating sequence.

The 59K21 is found in a number of AM30, AM61V and HM30 series units. Lennox parts documentation specifically identifies the 59K21 as the control board used in AM61V equipment.

Common Symptoms of a Failed 59K21 Control Board

• HVAC system will not start
• Blower motor will not operate
• Blower operates intermittently
• Blower runs continuously
• Equipment does not respond to thermostat calls
• Incorrect blower operation
• Intermittent system operation
• Relays on the board fail to energize
• Burned or damaged components on the board
• No control output despite proper incoming power

Buy the Lennox 59K21 / LB-90403A AHC1-2 Control Board from OemHvacPartsCanada.ca.