8 TROUBLESHOOTING

Symptom

Possible Cause

Corrective Action

No Heat (continued)

5.

Heating system requires service or

Diagonistic: Set SYSTEM Switch to HEAT and raise

 

 

thermostat requires replacement.

the setpoint above room temperature. Within a few

 

 

 

seconds the thermostat should make a soft click

 

 

 

sound. This sound usually indicates the thermo-

 

 

 

stat is operating properly. If the thermostat does

 

 

 

not click, try the reset operation listed above. If the

 

 

 

thermostat does not click after being reset contact

 

 

 

your heating and cooling service person or place

 

 

 

of purchase for a replacement. If the thermostat

 

 

 

clicks, contact the furnace manufacturer or a

 

 

 

service person to verify the heating is operating

 

 

 

correctly.

 

 

 

 

No Cool

1.

SYSTEM Switch not set to COOL.

Set SYSTEM Switch to COOL and lower setpoint

 

 

 

temperaturebelow room temperature.

 

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. Try resetting

 

4.

FAN Switch set to Fan ON.

the thermostat as described above. If the 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 some

 

 

influencing the cycle rate.

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 adjusted +/- 3 degrees.

Thermometer Disagree

 

adjustment.

See Temperature Display Adjustment in the

 

 

 

Operation section.

 

 

 

 

Thermostat Does Not Follow Program

1.

AM or PM set incorrectly in program.

Check current clock and program settings

 

2.

AM or PM set incorrectly on the clock.

including the AM or PM designations for each

 

3.

Voltage spike or static discharge.

time period. If a voltage spike or a static discharge

 

 

 

occurs use the Reset Operation listed above.

 

 

 

 

Blank Display and/or Keypad

1.

Voltage spike or static discharge.

Replace batteries and check heat/cool system

Not Responding

2.

Battery change required.

for proper operation. If a voltage spike occurs use

 

 

 

the Reset Operation listed above.

 

 

 

 

The Emerson logo is a trademark and a service mark of Emerson Electric Co.

www.white-rodgers.com

Page 7
Image 7
White Rodgers 1.00E+78 No Cool, Heat, Cool or Fan Runs Constantly, Furnace Cycles Too Fast or Too Slow, Not Responding

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