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Symptom Possible Cause Corrective Action
No Heat/ No Fan 1. Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.
(common problems) 2. Furnace power switch to OFF. Turn switch to ON.
3. Furnace blower compartment door or Replace door panel in proper position to engage
panel loose or not properly installed. safety interlock or door switch.
No Heat 1. Pilot light not lit. Re-light pilot.
2. Broken or melted anticipator wire. Excessive current or dead short in system. Have a qualifi ed service person check the system
3. Loose connection to thermostat before replacing thermostat.
or system. Verify thermostat and system wires are securely attached.
4. Thermostat or heating system requires Your furnace manufacturer or service person can describe how to test the heating system to
replacement or service. verify it is operating correctly. If the heating system is capable of operation and the no heat
5. System Switch not set to Heat. condition persists, replace the thermostat.
Set System Switch to Heat and raise temp above room temp.
Intermittent Heat 1. Furnace Lock-Out Condition Many furnaces have safety devices that shut the system down when a lock-out condition occurs.
If the heat works intermittently contact the furnace manufacturer or local service person for
assistance.
Heat or Fan Runs 1. Possible short in wiring. Check each wire connection to the thermostat to verify it is neatly looped under the terminals.
Constantly. 2. Possible short in thermostat. No extra wire should stick out from under the terminals.
3. Possible short in heat/cool/fan system.
Furnace Cycles Too Fast See Step 5, Adjusting the Anticipator. The anticipation setting is the only adjustment that effects the heating cycle rate. If an accept-
or Too Slow Narrow or able cycle rate is not achieved using the anticipator contact a local service person for addi-
wide temperature swing tional suggestions. The location of the thermostat, size of the Heat/Cool System and current
draw can infl uence the cycle rate.
Thermostat Setting and 1. Thermostat thermometer setting The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermom-
Thermostat Thermometer requires adjustment. eter pointer screw located inside the front cover to change the setting. For calibrating the
Disagree 2. Thermostat setting lever requires setting lever contact a local heating and cooling service person.
calibration.
Adjusting Thermometer 1. Thermostat thermometer disagrees The thermometer on the thermostat is accurately calibrated at our factory but you can adjust it
with other room thermometers. by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside
the front cover to change the setting.
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6
8
NEW THERMOSTAT OPERATION
This thermostat is easy to operate. After power is turned on, use the system switch to
select heating, or to turn the heating system off.
SPECIFICATIONS
ELECTRICAL DATA
Switch Rating...................................... 24 VAC (30 VAC max.)
Heating.................................................. 0.15 to 1.2 Amps
Anticipator Rating:
Heating.................................................. Adjustable from 0.15 to 1.2 Amps
THERMAL DATA:
Temperature Range............................. 50°F to 90°F (10°C to 32°C)
Operating Humidity Range................. 0 – 90% noncondensing
TROUBLESHOOTING
WR
Heat
Anticipator
(adjustable)
Heating
System
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
Figure 3. Typical wiring for single transformer heating system
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g
ers.com
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of Emerson Electric Co.
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trademark and service mark
of Emerson Electric Co.
HOMEOWNER HELP LINE: 1-800-284-2925