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Symptom

Possible Cause

Corrective Action

Furnace Cycles Too Fast or Too Slow

1. The location of the thermostat and/or the

Digital thermostats normally provide precise

(narrow or wide temperature swing)

size of the Heating System may be

temperature control and may cycle faster than

influencing the cycle rate.

some older mechanical models. A faster cycle
rate means the unit turns on and off more
frequently but runs for a shorter time so there is
no increase in energy use. If you would like to
increase the cycle time, clip Jumper W-905 as
mentioned in the instructions for Hydronic Heating
Systems. It is not possible to shorten the cycle
time. If an acceptable cycle rate is not achieved as
received or by clipping W-905 contact a local
service person for additional suggestions.

Cooling Cycles Too Fast or Too Slow

1. The location of the thermostat and the size

The cycle rate for cooling is fixed and can not be

(narrow or wide temperature swing)

of the Cooling System can influence the

adjusted. Contact a local service person for

cycle rate.

suggestions.

Thermostat Setting and Thermostat

1. Thermostat thermometer setting requires

The thermometer can be ad/- 3 degrees.

Thermometer Disagree

adjustment.

See Temperature Display Adjustment in the

Operation section.

Blank Display and/or Keypad Not

1. Voltage spike or static discharge.

Use the Reset Operation listed above.

Responding

Heat Setpoint will not Respond

1. The desired setpoint conflicts with the

Change system mode to COOL. Raise the Cool

to the Temperature Up Key

 setpoint of the COOL mode.

setpoint. Return to HEAT mode and set desired
temperature.

Cool Setpoint will not Respond

1. The desired setpoint conflicts with the

Change system mode to HEAT. Lower the Heat

to the Temperature Down Key

setpoint of the HEAT mode.

setpoint. Return to COOL mode and set desired
temperature.

TROUBLESHOOTING

CONTINUED FROM PAGE 7

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Summary of Contents for IF73

Page 1: ...at a time DO NOT LET WIRES FALL BACK INTO THE WALL 6 Install new thermostat using the following procedures To prevent electrical shock and or equipment damage disconnect electrical power to the system...

Page 2: ...ch require the changeover relay to be energized in COOL If the thermostat you are replacing or the heat pump being installed with this thermostat requires a B terminal to energize the changeover relay...

Page 3: ...y Switches 24 VAC Limit or Safety Switches COMMON COMMON Auxiliary Heating Transformer Class II Current Limited Heat Pump Transformer Class II Current Limited 24 VAC ACCESSORY RELAY N O CONTACT Polari...

Page 4: ...s for specific sys tem wiring informtion You can configure the thermostat for use with the following heat pump system types HEAT PUMP TYPE 1 Single stage compressor system gas or electric backup This...

Page 5: ...ate The Flame icon will display flashing to indicate that the Aux system is operating 3 Press to adjust the thermostat below room temperature The Aux heating system should stop operating To prevent co...

Page 6: ...tes 6 Select Compressor Lockout CL OFF or ON Selecting CL ON will cause the thermostat to wait 5 minutes before turning on the compressor if the heating and cooling system loses power It will also wai...

Page 7: ...ction to thermostat or system Verify thermostat and system wires are securely attached 3 Cooling system requires service or Same procedure as diagnostic for No Heat thermostat requires replacement con...

Page 8: ...and the size The cycle rate for cooling is fixed and can not be narrow or wide temperature swing of the Cooling System can influence the adjusted Contact a local service person for cycle rate suggest...

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