89
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Table 89-1:
Troubleshooting guide (continued)
Gas-to-steam (GTS) humidifier issues
Issue Possible causes Actions
Alert: Blocked flue • Blocked flue sensor is open • Check venting system for obstructions.
• Check air line to flue switch for obstructions.
• Windy conditions cause downdrafts in venting system. Install
a high wind vent cap or isolate as recommended by local
codes.
Alert: Gas valve [number]
fault
• Failed ignition module
• Miswired gas valve
• Check ignition module. Replace if necessary.
• Check gas valve wiring.
Alert: Burner [number] fault • No gas supply to unit • Verify that gas service valve is on and receiving minimum
pressure to manifold per rating plate.
• Gas valve is off or there is no power to the
valve
• Check for 24 VAC from the ignition module to the gas valve.
• Check that gas valve plug is seated properly.
• Gas valve outlet pressure is too low • Verify outlet pressure is set per rating plate.
• Blower inlet is dirty or obstructed • Clean inlet and check for obstructions.
• Flame sensor not sensing flame • Check flame sensor wiring.
• Check polarity at incoming power. Switch if necessary.
• Stray fiber from burner touching flame sensor. Use a
screwdriver to gently push down fibers near flame sensor.
• Flame sensor is cracked. Replace.
• Polarity reversed at power block • Check polarity.
Alert:
Ignition module [number] fault
• Ignition sequence engaged without power to
gas valve
• Verify ignition sequence.
• Replace ignition module.
• Gas valve/ignite/sensing electrode is out of
sequence
• Verify wire connections to gas valve, ignitor, and flame
sensing rod.
Alert:
Blower [number] fault
• The blower is incorrectly wired, or the
blower failed to meet demand speed
• Check for proper blower wiring.
• Replace blower.
Alert:
No power vent airflow
• The power venter air flow switch is open • Check for proper power vent wiring.
• Repair or replace power venter.
Alert:
Flue temperature switch
• Flue temperature is too high
• Tank is not full
• Unit automatically shuts off and cools down. The unit will
automatically restart when flue temperatures return to
normal.
Alert:
Tank temperature switch
• Flue temperature is too high
• Tank is not full
• Excessive inlet water temperature (over 90°F [32°C]).
• Check if water supply line strainer is plugged.
• Clean scale from tank and heat exchanger.
• Check supply water pressure. Provide supply water pressure
as specified on unit.
Alert:
Flue or tank overtemp cutout
• Flue temperature is too high
• Excessive inlet water temperature (over
90°F [32°C]).
• Unit automatically shuts off and cools down. The unit will
automatically restart when flue temperatures return to
normal.
• Tank is not full • Check if water supply line strainer is plugged.
• Check supply water pressure. Provide supply water pressure
as specified on unit.
• Excessive scale for tank and heat
exchanger
• Clean scale from tank and heat exchanger.
Alert:
Flue sensor out of range
• Signal outside of 4-20mA • Check P4 voltage from CS1 to ground (2-10vdc)
• Replace transmitter if no voltage output
• Check voltage on P6 from 21vdc to ground is 21vdc. If not,
re-check terminals for all field connections.
Troubleshooting guide
TROUBLESHOOTING
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