86
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 86-1:
Troubleshooting guide (continued)
Heating issues
Issue Possible causes Actions
Alert:
Tank temperature sensor
failed
• Open, shorted, or incorrect wiring of sensor • Check wiring terminals for correct wiring and voltages.
1000 Ohms = 68 °F (20 °C); 1702 Ohms = 212 °F (100 °C).
• Humidifier interlock switches and/or over-
temperature thermostat
• Verify that switch or thermostat is wired.
• Verify interlock switch is set correctly and humidifier cover is on.
• Reset over-temperature thermostat if tripped.
Alert:
Tank overtemp
• Unit has overheated; temperature is at 25 ºF
(14 ºC) over boiling temperature
• Check for proper water level in tank.
• Faulty sensor • Replace sensor.
Reduced or not output
(even though water level is
correct)
• Dirty heat exchanger • Clean.
• Dirty burners
• Low gas pressure
• Clean or adjust as appropriate. See tank manual for instructions.
Tank does not heat up. • Over-temperature thermostat switch located
under heater wiring cover tripped
• Reset thermostat switch.
• Humidifier cover interlock switch (select
models only)
• Humidifier cover not wired; adjust interlock switch.
• Incorrect or nonexistent control voltage • Check for proper supply voltage on electrical diagram.
• Verify proper transformer voltage characteristics.
• Verify proper wiring of transformer.
• Check for control circuit voltage on electrical diagram. If voltage
is not present, troubleshoot boards and wiring system for
potential short circuit.
• Incorrect or nonexistent supply voltage to the
unit
• Check main line fuse.
• Check main line safety switch.
• Check heater fuses and wiring diagram.
• Duct RH above high limit set point • Check for duct airflow.
• Verify operation of duct high limit switch or transmitter.
• No demand signal • Check signal by others.
• Check for miswired connection.
• Verify in the Settings menu that humidifier is configured for
demand signal.
• Humidifier is in Standby mode • Change mode to Auto.
Humidifier tank has proper
water level and is always
warm.
• Aquastat • This is normal; the aquastat is maintaining a certain tank water
temperature within range of 40 ºF to 180 ºF (4 ºC to 82 ºC).
• Readjust aquastat temperature to a lower set point.
Continued
TROUBLESHOOTING
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