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TROUBLESHOOTING GUIDE
Contact with electrical circuits can cause property damage, personal injury or death. Service and Troubleshooting must be
performed by qualified electrician.
For general operational problems, check to make sure humidifier is installed correctly .
TABLE 6 – Troubleshooting Guide
Problem
Possible Cause
General operating
Field-wired terminal
problems . Humidifier
connections .
will not turn on or
turn off .
Internal connections .
No power to humidifier .
Humidifier not turned on .
No power to 24 volt control
circuit .
Steam light does not
Call for humidity not being
turn on .
received .
Water is leaking from
Loose plumbing
humidifier .
connections .
Hoses are blocked .
Drain hose is blocked .
Water constantly runs
Debris in drain valve
down drain .
preventing it from closing .
O-ring in drain valve is not
properly seated in groove .
Water is flowing from fill
cup overflow port .
High static pressure in duct
is causing back pressure in
canister .
Humidifier is filling
High static pressure in
and water is flowing
steam line is causing back
down drain but Drain
pressure in canister .
light is not on .
22
CAUTION
Action
Verify L1, N/L2 and ground connections are properly wired and appropriate voltage is present .
Check HUMIDISTAT and (if used) FAN PACK terminal connections are tight and properly wired .
HUMIDISTAT terminals must be connected to an on/off device .
Check wiring connections and settings on Accessory items such as high limit switch and airflow
proving switch .
Check electrode and high water probe connections on the top of the canister .
Make sure ribbon cable from membrane switch is securely plugged into control circuit board .
Make sure black/white wire is attached to terminal that matches input voltage .
Check main power supply and switch .
Ensure breaker is sized appropriately for the amperage draw .
Check for proper voltage across L1 and N/L2 terminals .
Make sure front cover is attached to engage safety interlock switch . Press On/Off button .
Make sure ribbon cable from membrane switch is not damaged and is securely plugged into the
control circuit board .
Check fuse on PCB (replace with 5 amp slow burn fuse if necessary) .
With humidifier energized, check that LED light D8 is energized on the circuit board . If the LED is lit,
replace the membrane switch, if not, replace the circuit board .
Check humidistat wiring and setting . (Do not leave humidistat in TEST mode .)
Check wiring and settings of high RH limit switch and airflow proving switch .
Check water supply connection at fill valve inlet . Tighten as needed .
Check internal hose clamp connections . Reposition clamps and tighten as needed .
Check steam hose connection on top of canister . Tighten clamp as needed .
Check internal hoses and eliminate kinks or blockage .
Make sure drain hose has constant downward slope and is not blocked .
Remove canister and clean debris from drain valve .
Remove canister and check O-ring for damage . Replace O-ring as necessary . Ensure O-ring is properly
seated in its groove .
Check internal hoses and eliminate kinks or blockage .
Make sure dispersion tube is not discharging into duct with greater than 2 .0 in .wg static pressure .
Make sure dispersion tube tubelets are pointed up .
Install a tee and drain trap in any low points in the steam line . See Figure 4 .
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