TROUBLESHOOTING (continued)
TABLE 5 – Troubleshooting Guide
Symptom
Possible Reason
Troubleshooting Procedure
Dehumidifier does not | No power to unit.. | • Check that the dehumidifier is plugged in. |
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turn on/run.. |
| • Check that the power switch is turned ON. |
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| • Check that the control is turned ON. |
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| • Check that the circuit breaker has not tripped. |
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Dehumidifier blower is | Pressure drop across | • Check dehumidifier air filter and wash or replace. |
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running but with little or | dehumidifier is higher | • Check for blocked duct work and clear. |
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no airflow.. | than 0.4”w.c. for Model | • Verify that the outlet collar with backflow damper is installed on the outlet side of the dehumidifier. | |||
| 1830 or 0.6”w.c. for | ||||
| • Check if backflow damper is blocked or stuck and remove obstruction. |
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| Model 1850/1850W.. |
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Dehumidifier blower is | Float switch open.. | • If float switch installed, check connections at control board and empty condensate pan. | |||
running but compressor |
| • If no float switch installed check that the jumper is installed at the float switch terminals on the | |||
is not.. |
| control board.. |
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| Coil frosting.. | • Lack of or reduced airflow. Check dehumidifier air filter and wash or replace. |
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| • Check for blocked duct work. |
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| • Inlet air conditions below 60°F. Increase the humidity setting. |
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| Inlet air temperature is | • Verify all ductwork is properly sealed. |
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| outside of the 50°F – |
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| 104°F range or the dew |
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| point is below 40°F and |
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| there is a demand for |
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| dehumidification.. |
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When zoned, the | Incorrect damper wiring | • Verify wiring between dampers and 24 VAC transformer. |
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dehumidifier damper | or bad connection.. | • If wired for Two Zone operation, verify that 24 VAC transformer is 40 VA minimum. | |||
does not open in |
| • Check all wiring connections between dampers and control board. |
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INSTALLER TEST mode.. |
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| • Verify the normally closed dampers are in the Primary Zone ductwork and the normally open | ||||
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| dampers are in the Secondary Zone ductwork.. |
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The ventilation damper | Cycle time has been | • The damper will not open if the Ventilation Time has already been met. |
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does not open when the | met.. |
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HVAC fan is active.. |
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ODT error or outdoor air | • Check that the ODT is wired correctly to the |
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| Outdoor | Resistance |
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| outside of ODT range.. | dehumidifier control board and connections are secure.. | Temperature |
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| • Check that the ODT is installed in the outdoor air | 0°F | 84,500 Ohms |
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| intake according to the |
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| 20°F | 46,000 Ohms |
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| Ventilation Section beginning on page 19.. |
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| 40°F | 26,000 Ohms |
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| • Remove the ODT leads from the dehumidifier control |
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| 60°F | 15,500 Ohms |
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| board and check the resistance.. Compare the reading |
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| with the table shown.. | 80°F | 9,500 Ohms |
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| 100°F | 6,000 Ohms |
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Dehumidifier is not | Drain line blocked or unit | • Verify that the unit is level. |
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draining properly.. | not level.. | • Check the drain line blockages and for a continuous downward slope. |
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The HVAC fan turns on | Dehumidifier is sampling | • The dehumidifier will turn on the HVAC fan during air sampling or as needed to meet the ventilation | |||
unexpectedly.. | or ventilation in | time.. |
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| progress.. |
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Dehumidifier is | Normal function.. | • Air is reheated across the condenser coil, resulting in a temperature rise between inlet and outlet. | |||
producing hot air.. |
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26
