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Troubleshooting (continued)
DETECTING HEATING, COOLING AND FAN PROBLEMS (continued)
Symptom
Cooling will not come on.
Emergency Heat will not come on.
Fan will not come on.
Dampers do not position on a call for heating,
cooling or fan. Heat, cooling or fan will not come on
when the Zone 2, 3 or 4 thermostat is calling.
Fan immediately comes on with heat call.
After a cool call, the fan stops then starts right
away only to stop a short while later.
Both the HEAT and COOL LED are blinking.
Single transformer system. Install jumper between RC
and RH at HVAC equipment outputs of control panel.
Thermostat is not calling for cooling. Check voltage
at the thermostat Y input on the control panel.
Thermostat could be invoking a timed off delay.
Zone panel could be invoking a timed off delay.
Thermostat is power robbing or mechanical. Only use
line powered electronic thermostat with a C terminal.
Zone panel set up to for Zone 1 mode control
and Zone 1 O terminal is not energized.
Check ZONE 1/ANY ZONE dip switch and check
for voltage at Zone 1 O terminal.
An open or short in the DAS sensor has been
detected. Install or repair the sensor.
Emergency Heat (E-HEAT SELECTOR) slide switch
Heat Pump thermostats used with zone panel set
to ZONE 1 or AUX MINUTES set to a value other than
0 minutes. If heat pump thermostats are used in all
zones, set AUX MINUTES to 0 and set ZONE 1/ANY
ZONE switch to ANY ZONE. If heat pump thermostats
are not used, emergency heat can only be energized
with the E-HEAT SELECTOR switch set to ON.
Check if G is energized at the zone panel.
Check if G is energized at the thermostat.
Check if G is energized at the air handler.
System requires the Discharge Air sensor.
If DAS is not installed, only Zone 1 calls will be
recognized and dampers will not operate.
Disconnect power to the control panel, install the
DAS and restore power to the control panel.
ZONE 1/ANY ZONE switch set to ZONE 1. This allows
only heat calls when Zone 1 is in heat mode,
and only cooling calls when Zone 1 is in cool mode.
ELEC/GAS jumper set to ELEC – change setting
HVAC system has built in duct purge. Set PURGE/NO
PURGE jumper on control panel to NO PURGE.
An open or short in the DAS sensor has been
detected. Install or repair the sensor.
Page 27
Possible Solution
not set to ON.
to GAS.
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