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TROUBLESHOOTING GUIDE
SYMPTOM TROUBLESHOOTING PROCEDURE
HVAC blower does not turn on
when cycle time potentiometer
is in “TEST” mode
• Make sure there is power to the HVAC equipment.
• Check the wiring diagram for the R, C, W, Y, G
H
, and G
S
at the HVAC equipment,
thermostat, and the dehumidifier.
• Make sure the supplied Temperature Sensor is connected to the Outdoor Temperature
Sensor terminals or the System Setup block is set to “TIMED” mode.
• Check the voltage across the R and C terminals at the dehumidifier. Voltage should be
22 VAC minimum – 30 VAC maximum.
• In “TEST” Mode, the HVAC blower will activate for 1 minute, DO NOT LEAVE IN TEST
MODE AS DEHUMIDIFIER WILL NOT OPERATE.
The dehumidifier damper does
not open in “TEST” Mode
• Follow all of the system checkout procedures.
• Check the wiring diagram for the damper & 24 VAC transformer.
Air cycling operates continuously
after the potentiometer is taken
off “TEST” mode
• If the HVAC equipment is making a Heat or Cool call, or the fan is in Continuous
Operation, air cycling will remain on until the requirement set by the cycle period dip
switch and knob is met.
• If the interval is set at 1 HOUR and the cycle time is set at 60 minutes, air cycling will
be on continuously. Change the setting to a lower amount if this is not desired.
The ventilation damper does not open
when the HVAC blower is active.
• The damper will not open if the cycle time within the current period has already been
met. For instance if the cycle time is set to 5 minutes and the control has already
ventilated for 5 minutes in that interval, the damper will remain closed.
• If the outdoor temperature is below 0°F or above 100°F, the damper will remain closed
for energy efficiency.
• If using the Outdoor Temperature Sensor, check that it is installed in the Fresh Air
Intake a maximum of 3 feet from the outside, or on the North, East or West side of
the house. (Not in direct sunlight.)
The fan turns on unexpectedly • The control will turn on the fan as needed to meet the air cycling requirements
determined by the cycle time and cycle period settings.
The dehumidifier does not run • Follow all of the system checkout procedures.
• Check that the power switch on the dehumidifier is on.
• Check that the circuit breaker is not tripped. The dehumidifier requires a minimum
of 9 amps. It is recommended the dehumidifier be placed on its own dedicated
15 amp circuit.