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HEAT MODE
Output
Thermostat - W
Inducer
Pressure Switch
Ignitor
Gas Valve
Flame Sensor
Blower (Heat Speed)
Humidifier (24V)
Humidifier (120V)
EAC
On
LED
Fan
• The constant fan speed (G) is determined by the fan
speed tap selected with dipswitch SW1-2 (LO/HEAT
speed is default).
• There is a 1 second blower ON delay and a 1
second blower OFF delay for a fan only demand.
• Set thermostat to Fan ON for continuous fan.
Cool On / Off Delays
• Cool blower ON delay is 2 seconds.
• Cool blower OFF delay is 90 seconds.
Fault Recall
When the control is in standby mode, press and hold
the "FAULT RECALL" button for about 3-5 seconds until
the solid green LED turns off, then release the button.
NOTE: While displaying the stored fault codes, the
control will ignore any new call for heat, cool, or fan.
Fault Code Reset
When the control is in standby mode, press and hold
the "FAULT RECALL" button until the diagnostic LED
15 s
5-21 s
3 s
*45, 66 s
Amber LED - 42 Flash
Air Conditioner & Heat Pump
• Systems retrofitted with 50M56D-751 can be paired
directly with either a single stage air conditioner or
heat pump.
• 50M56D-751 will provide auxiliary heating during a
heat pump defrost cycle if it receives heat and cool
calls simultaneously (W + Y).
begins to rapid flash for about 7-10 seconds then
release the button.
The LED will turn off for 2 seconds after fault codes
are erased. Faults will automatically be cleared from
memory after 14 days.
NOTE: If the switch is held pressed for over 10
seconds, faults will not be cleared, rapid flash will stop,
and the LED will be solid green to indicate return to
standby.
OPERATION
*5/15 s
90, *135, 180, 225
Green LED – Solid On
TROUBLESHOOTING
5
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