Operating instructions

61
Operation
Troubleshooting guide.
Problem
number
Problem Possible cause Action
24
25
26
Slave # fault
Control does not
energize.
Unit does not fill with
water.
 LonTalk
®
communications cable
is not connected
between boards.
 Slave board does not
have power or has
incorrect power.
 Nonexistent supply
voltage to unit
 Nonexistent control
voltage
 Heater over-
temperature
thermostat open
 Malfunctioning fill
valve
 No water supply to fill
valve
 Connect LonTalk communications
cable.
 Verify power wiring on slave board.
 Check main line fuse.
 Check main line safety switch.
 Check heater fuses.
 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.
 Reset manual switch located above
heater or humidifier cover.
 First, disconnect brown wire and then
the orange wire from VAPOR-LOGIC
®
3
board terminals 30 and 31 of terminal
block J8. Fill valve should open.
 If fill valve does not open, verify
proper 24 VAC (terminals 1 and 2) 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.
 Check if water supply line strainer is
plugged.
 Verify that manual water line shut-off
valve is open and that pressure exists.
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Operation:
Troubleshooting guide