HUMIDIFYANDDEHUMIDIFYINDICATORS
The humidity screen (selected by pressing the HUMIDITY
button) uses the same triangles referenced in the above paragraph
to indicate the state of the HUM and DHUM outputs. When
humidification or dehumidification is active, the triangle under its
set point is turned on.
AUTO CHANGEOVER
When auto changeover mode is selected, a change from heat to
cool (or vice versa) will not occur until an opposite mode demand
has existed for 20 minutes. If set point is changed, 20-minute
requirement is deleted.
EMERGENCY HEAT MODE
When Thermidistat Control is configured as a heat pump and
emergency heat is selected, all Y signals are locked out, and W
becomes energized upon a call for heat.
POWER ON CHECK
When AC power is first applied, all segments of display are
turned on for a few seconds. Following this, temperature display
indicates model/configuration via following 2-digit code.
AC--1 - stage air conditioner
HP--l-stage heat pump
A2--2 - stage air conditioner
H2--2- stage heat pump
HS--l-stage heat pump with 3-stage auxiliary heat df--Hybrid
Heat
d2--Hybrid Heat with 2-stage.
ERROR CODES
.... If Thermidistat Control cannot properly read room
temperature, display will indicate -- and all outputs (except fan if
on) will turn off.
El, E2 -- There are no E1 or E2 error messages.
E3 -- If Thermidistat Control cannot properly read outdoor
temperature, and it is needed for proper operation, display will
indicate E3.
E4 -- If Thermidistat Control's internal memory fails, E4 will be
displayed. Replace Thermidistat Control.
E5 -- If Thermidistat Control cannot properly read humidity, E5
will be displayed. Replace Thermidistat Control.
E6 -- If defrost cycle continues for longer than 15 minutes. E6
will be displayed. Check heat pump wiring or for failed heat
pump defrost control.
SMART RECOVERY
With Smart Recovery selected, transition out of setback begins a
fixed time period before selected recovery time and gradually
adjusts room temperature so desired temperature will be achieved
at selected recovery time. The fixed time period is 1.5 hr. It
operates in both heating and cooling. This only applies to
programmable operation.
Thermidistat Control Troubleshooting
SYMPTOM WHAT TO CHECK
Open Thermidistat Control. Check for 24vac between R and C at screw terminals on mount-
No Display ing base. Reassemble, making sure pins on board engage sockets in mounting base. If
display does not appear, replace Thermidistat Control.
"- -" in place of room temperature Thermidistat Control cannot properly read room temperature. Replace Thermidistat Control.
Thermidistat Control cannot properly read outdoor temperature. Check outdoor sensor and
"E3" or "--" in place of outdoor temperature its wiring.
"E4" or "E5" Internal failure. Replace Thermidistat Control.
"E6" System is stuck in defrost. Check wiring and heat pump defrost control board.
Filter timer has expired. Clean or replace filter and then press VACATION and HOLD/END
"Clean Filter" icon displayed buttons together to reset.
See Installer Setup to force heating or cooling. Check for 24vac at equipment terminals. If
Cooling or heating will not come on
not present, check wiring.
See Installer Setup to force HUM or DEHUM. Check for 24vac at equipment terminals. If not
Humidify or dehumidify wilI not come on present, check wiring.
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