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TABLE 5 – Troubleshooting Guide (continued)
Problem Possible cause Action
Unit does not drain No power to drain valve • Verify drain valve electrical connections.
Drain fault, plugged
drain valve, or plugged
drain pipe
• Check drain valve piping.
Defective drain valve • If voltage is present at valve and it still does not open, replace valve.
Unit does not perform
end-of-season drain
Input signal always has
a demand
• Reduce demand signal.
Drain valve • Verify drain valve electrical connections.
• Check for plugged strainer in bottom of canister.
Humidity below
desired level
No humidity demand
signal from control
• Check for proper wiring.
Unit is operating but
fails to meet required
humidity output
• Increase control setting.
• Wire to 208 or 240 volts if originally on 120 V circuit.
• If water is siphoning from the steam canister to the overflow drain, check if there is
excessive internal steam pressure, determine the cause of the high pressure (e.g., high
duct static pressure, bent or crushed steam hose) and repair as required.
• If drain valve does not close fully, determine the cause and clean, repair, or replace as
needed.
• If fill valve is stuck open, repair or replace.
• Check steam hose and connections for leaks.
Steam canister not
heating
• Verify that control is calling for humidity.
• Check for control voltage if limit controls (airflow proving switch, etc.) are not allowing
unit to operate.
• Check input power circuit.
Water conductivity
too low
• Add 1/10 teaspoon table salt to fill cup.
Humidity above
set point
Improperly located
control
• Relocate, using guidelines described in this manual.
Malfunctioning controls • Check for incorrect supply voltage.
• Check for incorrect control signal.
• Check for improper wiring hookup.
• If control is malfunctioning, replace.
Hunting
(humidity swings
above and below
desired set point)
Malfunctioning control • If there is a faulty or inaccurate control, replace.
• Relocate poorly located control components. See humidity control placement
information in this manual.
Noisy operation Fill/drain valve noise • A clicking sound as the fill valve opens or closes, and a hissing sound during fill
are normal. A slamming sound as fill valve closes is “water hammer” and can be
minimized by installing a shock arrestor.
• A loud buzzing sound indicates poor alignment of valve stem. Replace valve.
Water dripping
or spitting from
dispersion tube
Foaming due to
impurities in canister
or steam hose
• Rinse canister and steam hose in clean water.
TROUBLESHOOTING GUIDE (CONTINUED)
15