8 TROUBLESHOOTING

Symptom

Possible Cause

Corrective Action

No Cool

1.

System Switch not set to Cool.

Set System Switch to Cool and lower temp below

 

 

 

room temp.

 

2.

Loose connection 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.

condition except set the thermostat to Cool and

 

 

 

lower the setpoint below the room temperature.

 

 

 

There may be up to a five minute delay before the

 

 

 

thermostat clicks in Cooling.

 

 

 

 

Heat, Cool or Fan Runs Constantly.

1.

Possible short in wiring.

Check each wire connection to verify they are not

 

2.

Possible short in thermostat.

shorted or touching together. No bare wire should

 

3.

Possible short in heat/cool/fan system.

stick out from under terminal screws. If the

 

4.

Fan Switch set to Fan On.

condition persists the manufacturer of your

 

 

 

system or service person can instruct you on how

 

 

 

to test the Heat/Cool system for correct operation.

 

 

 

If the system operates correctly, replace the

 

 

 

thermostat.

 

 

 

 

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, go to menu mode 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 changing cycle time from FAST to

 

 

 

SLOW on the menu mode 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 adjusted +/- 4 degrees.

Thermometer Disagree

 

adjustment.

See Temperature Display Adjustment in the

 

 

 

Operation section.

Blank Display and/or Keypad

1.

Thermostat loss of power

Check possible blown fuse or tripped breaker.

Not Responding

2.

Voltage spike or static discharge.

Turn the system power off. Wait for 5 minutes and

 

 

 

turn the power on.

 

 

 

 

www.white-rodgers.com

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Emerson 1F78H No Cool, Heat, Cool or Fan Runs Constantly, Furnace Cycles Too Fast or Too Slow, Thermometer Disagree
Page 5

1F78H specifications

The Emerson 1F78H is a cutting-edge thermostat designed to elevate the user experience while optimizing HVAC system performance. As a leading product from Emerson, it combines advanced features, user-friendly technology, and smart energy management to ensure maximum comfort in residential settings. Designed with efficiency in mind, the Emerson 1F78H is ideal for both heating and cooling systems, making it a versatile option for various home environments.

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Overall, the Emerson 1F78H is a top-tier thermostat that combines modern technology with user-friendly features. Its smart learning capabilities, stylish design, extensive compatibility, and remote access make it an excellent choice for homeowners aiming to create a more comfortable and energy-efficient living environment.
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