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92
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 92-1:
Troubleshooting guide
Power issues
Issue
Possible causes
Actions
Green power indicator light is off .
• No control voltage
• Check for proper supply voltage .
• Heater fuses open
• Check heaters and replace fuses .
• Transformer secondary circuit breaker tripped
• Check for wiring shorts; reset breaker .
No remote indication of alarm light
No remote activation of fan
• Dry contact or triac connection not programmed
from Setup menu
• Go to the programmable outputs section of Setup
menu to program dry contacts .
• Field wiring not installed
• Provide field wiring .
• Field-supplied remote fault indicator lamp is burned
out
• Check if at remote indicator light is burned out;
replace if needed .
• Remote fault Vapor-logic dry contact is not
switching
• Check dry contact continuity (Vapor-logic terminal
P12) for contact closure .
No readable information on
keypad/display
• No power or incorrect voltage to Vapor-logic
board
• Check main power supply .
• Reset control transformer circuit breaker if tripped .
• Reset thermal cutout if tripped .
• Low limit thermostat is not satisfied (outdoor
enclosure only) .
• Modular communication cable is disconnected
• Connect modular cable .
Keypad/display does not energize
• Nonexistent supply voltage to unit
• Check main fuse .
• Check main line safety switches .
• Check heater fuses .
• Nonexistent 24 VAC supply
• Check for proper supply .
• Verify proper transformer voltage characteristics .
• Verify proper wiring of transformer .
• Check for control circuit voltage, 24 VAC . If
voltage is not present, check transformer circuit
breaker . Reset if needed .
• Humidifier over-temperature thermostat open
• Reset manual switch located above heater below
terminal cover .
Display is completely black
• Keypad/display is overheated
• Cool the keypad .
• Communication cable not connected
• Connect cable .
• Defective cable
• Replace cable .
• Defective keypad
• Replace .
• Defective control board
• Contact DriSteem .
Continued
OPERATION