Carrier 33MC-URC - Troubleshooting

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Item Value Description
20
1:Heatpump Unit Configuration
0:ACOnly(indoor unit with or without electric heaters) Defaults to Heat Pump
21 1--- 199 in increments of 1
CCN Address of the unit
Defaults to 1
To display the hundreds, icon ON/O FF is .
22 0 –199 in increments of 1
Zone number --- Communications zone the system is located in
Defaults to 0
To display the hundreds, icon ON/O FF is .
24
0:StartinOffMode Auto Restart
1 : Start in last mode Defaults to “On”
This mode will exit automatically after 30 seconds of no buttons
being depressed.
NOTE: If units are grouped to one Room Controller, all units will
end up having the same configuration value.
Service test
mode
There is a hidden service test mode that is initiated through a
combination of button presses when the remote is off. The
following combination must be pressed within a 6 seconds period:
DOWN--FAN--UP--FAN--MODE
Once in service test mode, the service test mode message will be
sent, and “Sr“ will be displayed in the temperature icons until the
“DOWN“ button is p ressed.
During Service Test mode all the icons are off, the only button that
is active is the “DOWN” button.
To cancel Service Test Mode, press the “DOWN“ button to send a
normal message with “OFF“ mode.
Service Test Mode automatically times out after 30 minutes and the
remote will operate normally.
S When test mode is selected, the unit will operate as
described below:
⎯ The Unit Status (Green) and Timer (Yellow) LEDS
blink every 2 seconds.
⎯ The indoor fan will operate according to
user--selected speed. If user selected speed is Auto,
the fan will run in High speed.
⎯ If the unit is configured as an A/C Only unit, it will
operate in cool mode with demand.
S The louver will operate according to user--selected
position. If user selected louver is Auto, louver operates
according to cool louver.
⎯ If the unit is configured as a Heat Pump unit, the
louver will operate according to user--selected
position. If user selected louver is Auto, louver
operates according to auto heat or cool louver based
on operating mode.
The unit will run in cool mode for 3 minutes, then it
will run in heat mode for 2 minutes, or until the
indoor coil is greater than 104_F. The unit will run
in cool mode until test mode is exited.
Any of the following will cancel the test Mode:
S When the unit is turned off by the controller.
S If the power is cycled during the Test Mode, the unit will
return to its normal operating mode.
S After 30 minutes of receiving the last valid test request
message.
S Fail Mode
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Symptom Possible Cause Things to check Solution
No LCD display
1) mis--- wiring of the 12 volt power
to Room Controller control.
Verify that + 12 V and Ground are connected to
the proper terminals of the Controller.
Reference Installation wiring section for correct
connections
After disconnecting the
power, correct the wiring
problem and re--- cycle
power.
2) Power not online
Check that the units main power is connected.
The main control board should b e operating
normally
After verifying the wiring
to the Room Controller,
re--- cycle the unit power.
3) No 12 volts between P and G of
terminal block.
Check the installation of the J6 plug on the
main control board.
After disconnecting the
power, correct the wiring
problem and re--- cycle
power.
+12 volts applied to
Room Controller at
the correct terminals
and still does not
operate
1) The Room Controller is dam-
aged.
Change the Room Con-
troller and re--- cycle pow-
er.
33MC-- URC