TROUBLESHOOTING GUIDE
The following troubleshooting guide is intended to help diagnose and resolve general operational problems with the Steam Humidifier.
For general operational problems, check to make sure humidifier is installed correctly.
CAUTION
Contact with electrical circuits can cause property damage, personal injury or death. Service and Troubleshooting must be
performed by a qualified electrician.
TABLE 6 – Humidifier Troubleshooting Guide
Problem Possible Cause Action
General operating
problems. Humidifier
will not turn on or
turn off.
Field-wired terminal
connections.
Verify L1, N/L2 and ground connections are properly wired and appropriate voltage is present.
Check HUMIDISTAT 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.
Internal connections. 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.
No power to humidifier. 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.
Humidifier not turned on. 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.
No power to 24 volt control
circuit.
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.
“Steam” light does
not turn on.
Call for humidity not being
received.
Check humidistat wiring and setting. (Do not leave ADHC in TEST mode.)
Check wiring and settings of high RH limit switch and airflow proving switch.
Water is leaking from
humidifier.
Loose plumbing
connections.
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.
Hoses are blocked. Check internal hoses and eliminate kinks or blockage.
Drain hose is blocked. Make sure drain hose has constant downward slope and is not blocked.
Water constantly runs
down drain.
Debris in drain valve
preventing it from closing.
Remove canister and clean debris from drain valve.
O-ring in drain valve is not
properly seated in groove.
Remove canister and check O-ring for damage. Replace O-ring as necessary. Ensure O-ring is properly
seated in its groove.
Water is flowing from fill
cup overflow port.
Check internal hoses and eliminate kinks or blockage.
High static pressure in duct
is causing back pressure in
canister.
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.
Humidifier is filling
and water is flowing
down drain but
“Drain” light is not on.
High static pressure in
steam line is causing back
pressure in canister.
Install a tee and drain trap in any low points in the steam line. See Figure 4.
Humidifier drains
frequently.
Model 8043LCRP canister
used on water that is too
conductive.
Change to a Model 8043RP canister.
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