Lennox GWM-050IE User Manual

58
13 - TROUBLE SHOOTING
Is harness plugged into Supply
Water Sensor?
Is harness plugged into Control
Module J5?
_ P _ _ _
Blocking Error E 5 1 Supply Sens Open
Insert Harness
Replace Supply
Water Sensor
Disconnect J5 from Control
Module. Using digital meter
measure check continuity of
white wires between Control
and Sensor. Continuity?
Using digital meter measure
resistance between Supply
Water Sensor terminals J5-11
and J5-3. Measure resistance
of Sensor with digital meter.
Estimate Sensor temperature.
Does it fall in the range of the
Resistance Chart?
Replace Wires
50 to 9010 to 32
9K to 24K ohms
150 to 200
90 to 130
°F
°C
Resistance
130 to 150
2K to 1K ohms 2K to 3K ohms 3K to 9K ohms
54 to 66 32 to 54 66 to 94
Supply Water Sensor
Resistance Chart
Disconnect field wiring. Is
continuity between field wiring
neutral and ground less than
10 ohms?
Is field grounding conductor
connected to High Voltage
Terminal Strip 120 VAC (G)?
NO
YES
_ P _ _ _
Blocking Error E 4 6 Faulty ground
Connect ground
conductor
YES
NO
Correct faulty ground
conductor
Replace Control
Module
NO
YES
YES
NO
YES
NO
Replace Control
Module
Unplug J5 connector on Control
board. Using digital meter
measure resistance between
terminals J5-11 and J5-3.
Estimate Sensor temperature.
Does it fall in the range of the
Resistance Chart?
Disconnect J5 from Control
Module. Using digital meter
measure check continuity of
white wires between Control
Board and Sensor. Continuity?

Lennox GWM-050IE Specifications

General

Brand	Lennox
Model	GWM-050IE
Category	Boiler
Language	English