Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting page 45

This alert occurs when the fan status switch has sensed that the in-
door fan has been off for 10 seconds and the indoor fan feedback
has determined that the indoor fan should be on. Because the Fan
Status switch can be configured normally opened or closed, the
switch might be open or closed. The configuration for this switch
input can be found at Configuration
that the configuration is set correctly. Verify the wiring and fan sta-
tus switch. The hose should be connected to the high side of the
switch. If the IDF is configured to shut down the unit down when
this alert occurs (Configuration
this alarm can only be reset manually and the unit is shut down. If
the IDF is not configured to shut the unit down when this alert oc-
curs (IDF.F = NO), then this alert resets automatically and no spe-
cific control action is taken.
Alert Code T410
• R-W1 Jumper Not Installed in Space Temp Mode
This alert occurs when the control mode is Space Temperature
mode via Auto Select or Space Temp Select, yet there is no
power to W1. Verify that space temperature mode is the de-
sired mode or add jumper between R and W1 (on TB). This
alert resets automatically.
• R-W1 Jumper Must be Installed to Run Heat in Service
Test
This alert occurs when a request for a heat output has occurred
yet the W1 input is not high. A jumper must be installed be-
tween R and W1 (on TB) when trying to test heat in Service
Test. The alert will clear when Service Test is exited or if an-
other Service Test mode is selected. Remove jumper when
done using Service Test if the unit is operating with a thermo-
stat. The jumper should only be left in place if the unit is oper-
ating with a space temperature probe.
Alert Code T411 — Thermostat Y2 Input Activated without
Y1 Activated
This alert occurs in Thermostat mode when Y2 is energized
and Y1 is not. Verify thermostat and thermostat wiring. When
Y2 turns On, the software will behave as if Y1 and Y2 are both
On. When Y2 turns Off, the software will behave as if Y1 and
Y2 are both Off. This alert resets automatically when Y1 is
turned On.
Alert Code T412 — Thermostat W2 Input Activated without
W1 Activated
This alert occurs in Thermostat mode when W2 is energized
and W1 is not. Verify thermostat and thermostat wiring. When
W2 turns On, the software will behave as if W1 and W2 are
both On. When W2 turns Off, the software will behave as if
W1 and W2 are both Off. This alert resets automatically when
W1 is turned On.
Alert Code T413 — Thermostat Y and W Inputs Activated
Simultaneously
This alert occurs in Thermostat mode when Y1 or Y2 is ener-
gized simultaneously with W1 or W2. Verify thermostat and
thermostat wiring. The software will enter either the cooling or
heating mode depending upon which input turned on first. This
alert resets automatically when Y1 and Y2 are not on simulta-
neously with W1 and W2.
Alert Code T414
There are 10 different alerts under this one alert code. Pressing
enter and esc on the marquee or navigator to expand the T414
alert will show you one of the below alerts. All these alerts are
generated by the Belimo actuator and reported to the ECB.
These alerts can only occur if the ECB is controlling the actua-
tor digitally through MFT.
• Economizer Damper Actuator Out of Calibration
This alert occurs when the economizer actuator reports a con-
trol angle (Operating Modes
minimum control angle (Configuration
Initiate economizer
 
UNIT FN.SW. Verify
 
I.FAN IDF.F = YES), then
 
ECON C.ANG) less than the
 
ECON M.ANG).
calibration (Service

INDP E.CAL) using the Service Test menu. The economizer
calibration procedure will try to find new maximum open and
closed positions. If the alert does not clear automatically after
the calibration procedure is complete, investigate what is limit-
ing economizer rotation. After that step, run another calibra-
tion, but first power off unit (spring return the damper), loosen
the actuator clamp, and while pushing the damper closed, tight-
en the clamp. This alert resets automatically.
• Economizer Damper Actuator Torque Above Load Limit
This alert occurs when the actuator load is too high. Investi-
gate to determine what is increasing damper load, and verify
that the actuator is the correct size for the unit. This alert re-
sets automatically.
• Economizer Damper Actuator Hunting Excessively
This alert occurs when the commanded damper position is
changing too rapidly. The stop jog ratio must be less than 21%
to clear this alert. Leave the actuator powered with no signal
for a few hours to allow the ratio to decrease (may have to wait
longer than a few hours). If the alert continues, determine if the
ECB or actuator is bad. This alert resets automatically.
• Economizer Damper Stuck or Jammed
This alarm occurs when the actuator is no longer moving and
the actual position is greater than or less than 3% of the com-
manded position for 20 seconds. Investigate what is stopping
the rotation of the actuator and fix. This alert resets automati-
cally.
• Economizer Damper Actuator Mechanical Failure
This alert occurs when the actuator senses a catastrophic fail-
ure. Investigate actuator and replace if necessary. This alert re-
sets automatically.
• Economizer Damper Actuator Direction Switch Wrong
Position
This alert occurs when the economizer damper direction switch
is in the wrong position. The direction switch should be in the
clockwise position and the actuator should be mounted so that
the CW face of the actuator is accessible. Correct if necessary.
This alert clears automatically.
• Excess Outdoor Air
In this failure mode the economizer provides an excessive level
of ventilation, usually much higher than is needed for design
minimum ventilation.
• Economizer Economizing When It Should Not
In this case, conditions are such that the economizer should be
at minimum ventilation position but for some reason it is open
beyond the correct position.
• Economizer Not Economizing When It Should
In this case, the economizer should be enabled, but for some
reason it is not providing free cooling.
• Damper Not Modulating
This issue represents a stuck, disconnected, or otherwise inop-
erable damper that does not modulate open and close.
Alert Code T415 — IAQ Input Out of Range
This alert occurs when the IAQ input (on ECB) is less than 3.5
mA and the sensor is configured as installed. IAQ operation
will be disabled. Check sensor and wiring. This alert clears au-
tomatically.
Alert Code T416 — OAQ Input Out of Range
This alert occurs when the OAQ input (on ECB) is less than
3.5 mA and the sensor is configured as installed. OAQ opera-
tion will be disabled. Check sensor and wiring. This alert clears
automatically.
Alert Code T418
There are 4 different alerts under this one alert code. Pressing

enter and esc on the marquee or navigator to expand the T418
Test
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