68
Operation
Operation:
Troubleshooting guide
Troubleshooting guide.
Problem
number
Problem
Possible cause
Action
(continued)
27
28
(continued)
Fill valve does not
close
Reduced or no output
(even though water
level is correct)
Fill valve is stuck
Heater
malfunctioning
Malfunctioning
control system
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
will not allow valve to seat properly.
Clean or replace valve as needed.
Check for control voltage across fill
valve coil. (Check wiring and controls.)
Verify that proper voltage is being
applied to heaters.
Check heater amperage.
If heater contactor is not functioning,
replace.
Check if heater fuses are blown and
replace if required.
Check if auxiliary limit controls are not
allowing system to operate (i.e., duct
humidistats, air flow proving switch,
etc.). Reset, replace or calibrate as
needed. (Air flow switch, terminals 12
and 13, measures 24 VAC if open. On-
off high limit, terminals 25 and 26,
measures 21 VDC if open.)
Check if the (optional) heater over-
temperature thermostat has been
tripped. Reset if necessary.
Replace zone valve if end switch is not
closing.
More on next page ...
VL3-IOM-0301-METRIC.pdf 72
11/19/2009 9:22:40 AM
Summary of Contents for Vapor-logic3
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