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