American Standard ACONT203AS42MA Installation And User Manual - Page 19
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7.
Troubleshooting
SYMPTOM
POSSIBLE CAUSE
1.) Blown fuse or tripped circuit breaker
No Heat/
2.) Furnace power switch to OFF
No Cool/
3.) Furnace blower compartment door
No Fan
panel loose or not properly installed
(common
4.) Loose connection to thermostat or
problem)
system
1.) System not set to Heat
2.) Loose connection to thermostat or
system
No Heat
3.) Heating System requires service or
thermostat requires replacement
1.) System not set to Cool
2.) Loose connection to thermostat or
system
No Cool
3.) Cooling System requires service or
thermostat requires replacement
Heat, Cool or Fan
Possible short in wiring, thermostat, heat,
Runs Constantly
cool or fan system
Thermostat
Display &
Thermostat display requires adjustment
Thermometer
Disagree
Furnace (Air
Conditioner)
Cycles Too
The location of the thermostat and/or
Fast or Slow
the size of the Heating System may be
(narrow or wide
influencing the cycle rate
temperature
swing)
1.) Heating system is not able to heat
the space to within 10 degrees of the set
point within 2 hours
2.) Cooling system is not able to cool
the space to within 10 degrees of the set
point within 2 hours
"Call for Service"
3.) If "--" is displayed for the Room
icon appears on
Temperature, a replacement thermostat
displayed
is needed
4.) None of the buttons operate on the
thermostat
5.) If "Call for Service" is flashing,
compressor self diagnostic is detecting
an issue with the outdoor unit
Pub. No.
11-HD19D1-1D-EN
09/2020
Part No. 37-7777006
American Standard 203 Programmable Thermostat
CORRECTIVE ACTION
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
4.) Tighten Connections
1.) Set thermostat to Heat.
2.) Verify thermostat and system wires are securely attached.
3.) Diagnostic: Set System to Heat and raise the set point above room temperature.
Within five minutes the thermostat should make a soft click sound and "Heat On"
should appear on display. This sound indicates the thermostat is operating properly. If
the thermostat does not click, try the reset operation listed below. 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 system is operating correctly.
1.) Set thermostat to Cool.
2.) Verify thermostat and system wires are securely attached.
3.) Diagnostic: Set System to Cool and lower set point below room temperature. Same
procedures as diagnostic for "No Heat" condition except set the thermostat to Cool and
lower the set point below the room temperature. There may be up to a five minute delay
before the thermostat clicks in Cooling if the compressor lock-out option is selected in
the installer menu. (see INSTALLER MENU, item 50)
Check each wire connection to verify they are not shorted or touching other wires. Try
resetting the thermostat. If the condition persists contact your HVAC service person.
Display can be adjusted +/-5°. See User Menu item 05
Digital thermostats provide precise control and cycle faster than older mechanical
models. The system turns on and off more frequently, but runs for a shorter time. If
you would like to increase cycle time, choose SLO for slow cycle in the Installer menu.
(Reference menu items 30, 32 & 35.) If an acceptable cycle rate is not achieved,
contact your HVAC service person.
1.) See corrective action for "No Heat"
2.) See corrective action for "No Cool"
3.) Replace thermostat
4.) Make sure keypad lockout is not turned on ( ), If it's OFF, try reset shown below.
5.) Contact a service person to verify the outdoor equipment is operating correctly
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