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TROUBLESHOOTING
SYMPTOM
CAUSE
When not using a
There is not enough
common wire the air
power available to
conditioning equip-
"power share."
ment tries repeatedly
to turn on, but cannot.
At times the display
dims or disappears.
The air conditioning
The compressor timer
does not attempt to
lockout may prevent
turn on.
the air conditioner
from turning on, for a
period of time.
The display is blank.
Lack of proper power.
The air conditioning
The cooling set point
does not attempt to
is set too high.
turn on.
The heating does not
The heating set point
attempt to turn on.
is set too low.
The strip heater turns
Heat pump is incor-
off well before reach-
rectly selected "on" in
ing set point.
the Advanced Setup.
Copyright 2005 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 02-DFC536SI
Book 1
4
Tab
3e 2f
REMEDY
Connect a 270 ohm,
10 watt power resis-
tor at the unit as
shown below.
For Problem A/C
R
H2
Y
C
TR300-10w
For Problem Heat
R H2
Y
C
TR300-10w
See the Advanced
Setup section to
defeat the cycles per
hour and compressor
timeguard.
Check for 24 vac
between R and C.
Press the down arrow
until the cooling set
point is 10 degrees
lower than the room
temperature.
Press the up arrow
until the heating set
point is 10 degrees
higher than the room
temperature.
Select heat pump
"off" during Advanced
Setup programming.
See the Advanced
Setup section.
Printed in U.S.A.
CALIBRATION
CALIBRATION: Every thermostat is calibrated before it
leaves the factory. Under normal circumstances there will
never be a need to recalibrate the thermostat. To accom-
modate s pecial needs , the thermostat may be recalibrat-
ed following these steps:
1. While holding the Mode button in, press the down
button for 5 seconds. After all the icons in the dis-
play appear, release the buttons.
2. Press the Mode button twice.
3. Press the up or down buttons until the flashing
number equals the current room temperature.
4. Press the Mode button to return to normal
operation.
Form 53-6SI
Pg 4
11-05
Replaces: 53-3SI
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