Field Controls HHSC+, User Manual, Page: 16 / 20

page 16
PROBLEM: BLANK DISPLAY ON THE HHC+
SOLUTION CHECK
1. Make sure controller cover is firmly seated in the base; press firmly on the HHSC+ to ensure contact of pins
2. The furnace has power
3. The thermostat is operational
4. The furnace will call for heat from the thermostat
5. The fan operates with a fan only signal from the thermostat
6. Confirm the furnace is providing 24 VAC to the HHSC+
7. Verify wiring conforms to wiring diagrams and connections are dry and tight.
PROBLEM: HHSC+ TURNS FURNACE FAN ON AND OFF, BUT THE MOTORIZED DAMPER DOES NOT
CYCLE
SOLUTION CHECK
1. Verify that the mode selector switch on the FAD damper motor is in the “Auto” position
2. Verify that the HHSC+ is providing a 24 VAC signal to the FAD damper
3. Verify that the FAD damper is operational by disconnecting from the HHSC and applying 24VAC to blue
and white wires (open), and then red and white (close).
4. Verify continuity in the wiring between the damper and the HHSC+.
PROBLEM: A/C TURNS ON DURING FAN CYCLING CALLS
SOLUTION CHECK
1. Verify wiring conforms to appropriate wiring diagram.
2. Verify the GT and GF wires are properly connected. The G wire normally running between the thermostat
and the HVAC equipment needs to be interrupted by the HHSC+. Do not run the G wire in parallel GT
and/or GF terminals. The HHSC+ should not back-feed power to the thermostat from the GT terminal by
internal energization.
LED STATUS INDICATOR LIGHT
A steady green light indicates that the Healthy Home System is operating properly. A steady red light
indicates action should be taken; one or more messages will be displayed on the display, giving instructions
for corrective action(s), such as HVAC filter life expiration, UV lamp life expiration, or a fault having been
detected with the FAD damper (if enabled); see Normal Operation Display and LED Status section. The
display will also indicate how to reset the LED and display after such an event.
OPERATION