8
RESEARCH PRODUCTS CORPORATION
P.O. BOX 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 •
www.aprilairecontractor.com
TROUBLESHOOTING
(CONTINUED)
Symptom
Possible Cause
Corrective Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
1. Replace fuse or reset breaker.
2. Turn switch to ON.
3. Replace door panel in proper position to engage safety interlock or door switch.
No Heat
1. Pilot light not lit.
2. System Switch not set to HEAT.
3. Loose connection to thermostat or
system.
4. Furnace Lock-Out Condition. Heat may
also be intermittent.
5. Heating system requires service or
thermostat requires replacement.
1. Re-light pilot.
2. Set System Switch to HEAT and raise setpoint above room temperature.
3. Verify thermostat and system wires are securely attached.
4. Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat
works intermittently, contact the furnace manufacturer or local service person for assistance.
5. Diagnostic: Set System Switch to HEAT and raise the setpoint above room temperature. Within
a few seconds, the thermostat should make a soft click sound. This sound usually indicates the
thermostat is operating properly. If the thermostat does not click, try the reset operation listed on
page 7. 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.
2. Loose connection to thermostat or
system.
3. Cooling system requires service or
thermostat requires replacement.
1. Set System Switch to COOL and lower setpoint below room temperature.
2. Verify thermostat and system wires are securely attached.
3. Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower
the setpoint below the room temperature. There may be up to a fi ve minute delay before the
thermostat clicks in Cooling.
Heat, Cool or Fan Runs
Constantly
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
4. Fan Switch set to Fan On.
1. – 4. Check each wire connection to verify they are not shorted or touching together. No bare wire
should stick out from under terminal screws. Try resetting the thermostat as described on page
7. 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 (Air Conditioning)
Cycles Too Fast or Too
Slow (narrow or wide
temperature swing)
The location of the thermostat and/or the
size of the Heating (Cooling) System may
be infl uencing the cycle rate.
Digital thermostats normally provide precise temperature control and may cycle faster than 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.
Thermostat Setting and
Thermostat Thermometer
Disagree
Thermostat thermometer setting requires
adjustment.
The thermometer can be ad/- 3 degrees. See
Select Temperature Display Adjustment
(#3
in the Confi guration Menu section).
Thermostat Does Not
Follow Program
1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the clock.
3. Voltage spike or static discharge.
4. Thermostat may be performing
Progressive Recovery actions.
1. – 3. Check current clock and program settings including the AM or PM designations for each time
period. If a voltage spike or a static discharge occurs use the
Reset Operation
listed on page 7 in
this Troubleshooting section.
4. Disable Progressive Recovery by clipping W903 if this feature is not desired.
Blank Display and/or
Keypad Not Responding
Voltage spike or static discharge.
Use the
Reset Operation
listed on page 7 in this Troubleshooting section.
61000475 5.06
B2204150A
Printed in China
LIMITED WARRANTY
Your Research Products Corporation Aprilaire
®
Thermostat unit is expressly warranted for two (2) years from date of installation to be free from defects in materials and workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any thermostat which is found to be defective within a two (2) year period and which
is returned, together with the date of installation, no later than thirty (30) days after said two (2) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY
YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID TWO YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S
LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE
ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR
CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitations may not apply to you.
This warranty gives you specifi c legal rights and you my also have other rights which vary from state to state.
WARRANTY REGISTRATION
Please… Take a few minutes to visit us online at
www.aprilaire.com
to register your Aprilaire product. If you do not have online access,
please mail a postcard with your name, address, phone number, product or model purchased, date of purchase and dealer name to:
Research Products Corporation, P.O. BOX 1828, Madison, WI 53701
YOUR WARRANTY REGISTRATION INFORMATION WILL NOT BE SOLD OR SHARED OUTSIDE OF THIS COMPANY.
