Specification

80 Customer Service: 252.522.3031
Troubleshooting
Troubleshooting
Gas Water Heaters
Figure 3: Closed Circuit Voltage GSK-3
Switches Included
Figure 3 : Closed Circuit Voltage
GSK-3 Switches included
GSK-3 Spill Switch
Gas Control Valve
Gas Supply Line
Gas Pressure
Switch
Thermocouple
Black
Main Gas
Line
Bleed Tube
Elbow
Millivolt Meter
Pilot Gas
Line
Red
GSK-3 Spill Switch
Gas Control Valve
Gas Supply Line
Gas Pressure
Switch
Thermocouple
Red
Black
Main Gas
Line
Bleed Tube
Elbow
Millivolt Meter
Figure 4 : Closed Circuit Voltage
GSK-3 Switches not included
Pilot Gas
Line
Figure 4: Closed Circuit Voltage GSK-3
Switches NOT Included
2. If the GSK-3 switches have not tripped:
• Inspect the GSK-3 and 12 gauge wire safety
circuit for loose or dirty electrical connections.
Clean and tighten all connections of corrosion or
other contaminants, and apply dielectric grease
as necessary to prevent corrosion.
• Check the GSK-3 and 12 gauge wire safety
circuit for excessive electrical resistance using
an ohmmeter/multimeter by removing the two
wires from the TCA thermocouple adapter, and
connecting the test leads to the ends of the wires
and across each individual component of the
circuit. All parts of the circuit should indicate near
zero ohms resistance when measured with a
multimeter. Any parts that have a high resistance
are defective and should be replaced.
• Check the thermocouple for sufficient
output: Refer to Figures 3 and 4 for technique
description. Millivolt output should be between
8 and 14 millivolts when measured as shown in
Figure 3, and between 17 and 25 millivolts when
measured as shown in Figure 4.
• If thermocouple output is within or above the
stated ranges, there may be a problem with the
gas supply of the gas valve. Check gas supply
pressure and gas valve operation.
• If thermocouple output is below the stated
ranges: relocating the thermocouple tip as
illustrated in Figures 2 and 8 increases the heat
impingement on the thermocouple tip, which
results in an increase in the millivolt output.
Application of the technique can result in an
increase in millivolt output from a range of 8 to
11.5 millivolts to a range of 17 to 20 millivolts, as
measured as shown in Figure 4.