State Industries GS6 50 YBRS Series 200 User Manual

31

Has the thermal switch 
tripped?

Check for insufficient 
combustion air.

Are there openings 
for make-up air to 
enter the room?

Are the openings of sufficient size? 
See “Combustion Air Supply and Ventilation” 
section in this manual for requirements.

Is there a furnace/air 
handler in the same room as 
the water heater?

Does the return air duct for the furnace/air handler draw 
its air from a separate location than the water heater? 
See the “Location Requirements” and “Combustion Air 
Supply and Ventilation” sections in this manual.

Is there proper drafting at the 
draft hood? See “Checking the 
Draft” section in this manual.

Is the flame-arrestor free from 
debris due to excessive lint, dirt, 
dust or oil?

Check the water heater for a Flammable Vapor (FV) event. Note: it may be 
necessary to remove the manifold door assembly to visually inspect the water 
heater. Reference the “Maintenance of your Water Heater” section of this 
manual for removal instructions.

Is the igniter wire insulation burnt or 
show signs of discoloration?

Install correct size make-up air openings per 
the “Combustion Air Supply and Ventilation” 
section in this manual.

Correct size of openings to 
allow sufficient air.

Refer to the “Maintenance of Your Water Heater” section of this 
manual for information on cleaning the flame-arrestor. 

Check the vent system for restrictions/obstructions and check the vent 
termination height. Refer to the “Installation Instructions” section of this 
manual for specific requirements.

Is the pilot tube 
damaged?

Does the flame 
arrestor show signs 
of discoloration and/
or debris?

Shut-off the gas supply to the water 
heater at the manual gas shut-off valve, 
then contact Residential Technical 
Assistance by referencing the phone 
number on the front of the Installation 
Instructions and Use & Care Guide.

Contact a local Heating, Ventilation, Air 
Conditioning & Refrigeration authorized 
service provider.

Does pilot light go out when 
button is released?

Check Draft. (See “Checking the 
Draft” section of this manual.)

Is the thermocouple 
connection loose?

Tighten the connection

Test the thermocouple using the following 
procedure: Disconnect the thermocouple from the 
gas control valve/thermostat. Using a multimeter 
with alligator clip leads, attach the red lead to 
the body (copper part) of the thermocouple. 
Attach the black lead to the end (silver part) of 
the thermocouple that connects to the gas control 
valve/thermostat. Follow the instruction to light 
the pilot and watch the voltage readings on the 
multimeter. After 45 seconds the meter should 
read 12 millivolts DC or more.

Does the thermocouple pass the test?

Are the wires from the gas 
control valve/thermostat firmly 
connected to the switch?

Are the wires damaged 
and/or frayed?

Secure connections 
and attempt a relight.

Replace the gas control 
valve/thermostat.

Replace the thermocouple.

Is the base-ring filter clean (i.e., free 
of lint, dust, or debris)?

Inspect and clean the base-ring filter. Refer to the “External 
Inspection & Cleaning of the Base-Ring Filter” section of this manual. 

THERMAL
SWITCH