Lennox GWM-050IE

53
Inspect burner through sight
glass. Is flame present?
NOYES
_ P _ _ _
Blocking Error E 3 5 False flame detect
Replace Control
Module
Turn Gas Shutoff
Valve clockwise to
closed position.
Follow instructions TO TURN OFF GAS
TO APPLIANCE.
Replace Gas Valve.
Turn off manual gas
shutoff valve.
Follow instructions
TO TURN OFF GAS TO
APPLIANCE. Replace
Gas Valve.
Follow Operating Instructions
to initiate boiler operation.
Enter Installer Menu, Boiler
Status, Flame Signal.
Is ame signal greater than
3.7µA
(Boiler may be running at any
ring rate)?
YES
NO
Replace Control
Module
Replace Flame
Sensor and Burner
13 - TROUBLE SHOOTING