Carrier bryant Multi-Zone 38MARBQ09 18AA3 Series Service Manual page 15

40MBQB09~48--3 Ducted
Indoor Fan Error – E3 (page 1 of 2)
Error Code
Indoor Unit or Wired Control Display – E3
Malfunction decision conditions
Supposed Causes
Troubleshooting:
Follow the "1st Steps for DLS Troubleshooting"
in the beginning of this guide, if you have an
active error, procedure below.
Shut OFF the power supply.
Rotate the Indoor fan by hand.
Does the fan rotate freely?
Ohm out reactor, remove wires first. Reading
should be close to Zero between terminals. Also
check each connection to ground, this should be
open. If not replace.
Check fan motor connections,
some units also have fan driver
board, check these as well. Were
any connections loose or off?
Error may only displayed every 3 minutes, during this time you may
see either "normal display" or "88" on indoor unit or wired control.
No
Yes
Yes
Reseat/Reconnect fan wires,
retry system operation
E3 – Indoor Fan Problem
Dr. Smart Display (Debugger) – E3
When the indoor fan speed is too slow (300 RPM
or less) for 3 minutes or more, the unit stops and
the LED displays the Error Code for 30 seconds.
Then retries until locks out.
• Wiring mistake
• Fan motor faulty
• PCB faulty
Dr. Smart
Display
Free up, replace any broken
parts so fan spins freely
No
Replace Motor, Main PCB &
Fan Inverter (Driver) PCB
If after parts replacement, E3 is
still displayed, contact your local
CE Technical Support Rep.
• Reactor faulty
Continued on next page