Specifications

14
CONTROL PANEL
LIGHTS
PROBLEM FILL READY DRAIN POSSIBLE CAUSE RECOMMENDED ACTION
WATER
Humidifier will Off Off Off Control transformer Verify control voltage across secondary
not heat leads of transformer. Reset transformer
circuit breaker.
Off On Off Humidistat is not calling Set humidistat to call. Inspect for faulty
humidistat.
Safety controls open Check safety controls, air flow switch, high
limit humidistat, etc.
Faulty control board Verify control voltage between terminals
H & N.
Probe head deterioration* Replace probe head.
Humidifier will On Off Off No water pressure at valve. Check water supply/shut off valves.
not fill
Faulty water fill valve Verify action of fill water solenoid valve by
turning control module switch from standby
to normal op. Audible click should be
heard as solenoid operates.
Plugged strainer Check strainer.
Plugged valve Check valve.
Faulty control board Verify control voltage across terminals
H & N.
Humidifier does On Off Off Lack of tank to probes Jumper wires brown to yellow. If water
not stop filling electrical continuity. Water stops, verify tank ground; check water
conductivity 100 supply conductivity; then consult factory.
micromhos/cm (2 gr/gal) min.
Fill valve is stuck open Check valve for foreign matter.
Drain Valve not closed Check for correct water flow, through valve,
Fill valve installed backward note arrow.
On Off On Auto-drain mode 10 Minute must complete first.
Low output Off On Off Electric drain valve not Correct cause of leakage or replace valve.
seating
Off On Off Fill valve is stuck open Check valve for foreign matter.
Unit short cycles
On & Off On Off Probes may be incorrectly Confirm that unit is wired per diagram.
wired or need cleaning Clean probe rod tips with steel wool.
Reduced or no Off On Off Heater malfunctioning Verify that proper voltage is being applied to
output even heaters. Check heater (amp draw and
though water compare to wiring diagram ratings.
is at the proper
level
Malfunctioning control Heater contactor not functioning replace.
system Service fuses blown. Auxiliary limit controls
not allowing system to operate (dust humidistat,
air flow proving switch, etc.). Reset, replace or
calibrate as required. Faulty or inaccurate
humidistat, replace or calibrate.
VAPORMIST
®
TROUBLE-SHOOTING GUIDE
*Probe rod corrosion or probe head material aging may cause level control system failure.
This generally does not occur in the first two years of operation.
VM-IOM-1996 Scan.pdf 14 11/19/2009 9:57:23 AM