84
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 84-1:
Troubleshooting guide (continued)
Filling issues
Issue Possible causes Actions
Unit does not fill with water. • Malfunctioning fill valve • Unplug probe head. Fill valve should open. If fill valve does not
open, verify proper 24 VAC to fill valve. If voltage is present and
valve does not open, replace valve or valve coil.
• Verify that coil is 24 VAC.
• Verify that valve stem moves freely.
• No water supply to fill valve • Check if water supply line strainer is plugged.
• Verify that manual water line shut-off valve is open and that
pressure exists.
• Check that in-line needle valve is open.
• Unit is not in Auto Mode • Change mode to Auto.
• Vapor-logic control is in end-of-season
drain mode
• Check for humidification demand signal at control board.
• Inlet water needle valve is closed • Check needle valve.
• Unit is in freeze protection draining • Change mode to Auto.
• Fill valve stuck in closed position • Recycle power to recycle fill valve closing and opening.
• Malfunctioning level control system • See below.
Fill valve does not close • Open drain valve • If automatic drain valve is locked in the manual open position,
reset to automatic.
• Replace valve if there is a broken return spring on the drain valve.
• Clean or replace drain valve if an obstruction in the valve does not
allow complete closure.
• Close manual drain valve if it is open.
• If Vapor-logic shorted output to fill valve coil, replace board or
drain coil.
• Malfunctioning level control system • Check that probe plug is plugged in fully.
• If needed, clean probe rods or replace.
• Replace board if Vapor-logic control board is defective.
• Verify that system is in auto mode.
• Verify that probe is wired correctly.
• Fill valve is stuck • Check if fill valve is installed backwards. If yes, repipe.
• If there is a faulty internal spring or diaphragm in the fill valve,
replace valve.
• Check if there is an obstruction that does not allow valve to seat
properly. Clean or replace valve as needed.
• Check for control voltage across fill valve coil. (Check wiring and
controls.)
• Install water inlet shock arrestor.
Continued
TROUBLESHOOTING
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