REV. B Page 20
Round & Square Flat Disc
SECTION B THERMOCOUPLE FLAME SENSE (TFS) INST
ALLA
TION
TROUBLE SHOOTING FOR TFS MODELS
TROUBLE SHOOTING
FAULT CODES
The VCS-5000MODTC control module has built-in error detection for several common operating fault conditions. When
the control module detects an error, it will emit a series of beeps. The beeping pattern will help to determine the cause of
the operating fault
.
Ignition Safety (Protection for ignition system):
Error Code
: One beep every one second.
Description of Fault
: Warn users if the pilot is not successfully ignited in 15 seconds.
How to Clear:
Press OFF then ON buttons to re-attempt ignition.
What to Check
:
1. Ensure gas supply is turned on.
2. Ensure that the gas line is purged of air. Air is common in the gas line if the appliance has just been installed, has
been disconnected then re-connected to the gas line, or if the appliance has been unused for an extended period
of time.
3. Ensure there is no blockage in the gas line.
4. Make sure that the flame sensor electrode is clean. Soot buildup will insulate the electrode and will not allow for
proper flame sensing.
5. Ensure orange/white leads from module are plugged into the “PILOT” connection on the valve body.
6. Ensure green/white leads from module are plugged into the “MAIN” connection on the valve body.
7. Verify lead from igniter on electrode assembly is connected to the “I” terminal on the module.
8. Verify lead from flame sensor on electrode assembly is connected to the “S” terminal on the module.
9. Verify that the black ground lead from the module is connected to a proper ground on the appliance.
Sensor Safety (Protection for flame sensor):
Error Code
: 4 Beeps every one second (Constant beeping)
Description of Fault
: Warn users the flame sensor detects a flame already present when ignition sequence is initiated.
This fault will also occur if the flame sensor is shorted to ground.
How to Clear
: Press OFF then ON buttons to re-attempt normal ignition.
What to Check
:
1. Check if flame is actually present when valve is turned OFF (if so, replace valve).
2. Ensure that the flame sensor electrode is not touching the burner or another metal surface.
3. Check to ensure ground wire from thermocouple and module is connected to gas valve.
4. If 3-probe ignitor is exposed to excessive moisture/water it will need 24-48 hours to dry out.
5. Replace electrode assembly.
6. Replace module.
