Carrier bryant Multi-Zone 38MARBQ09 18AA3 Series Service Manual page 17

MAQ High Wall, MBD/MBQ Ducted, MBF Floor, MBC Cassette
Sensor Error E4 / E5 (page 1 of 3)
Error Code
Indoor Unit or Wired Control Display
E4 / E5
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.
Check the connection between
the temperature sensor and the PCB.
Is it properly wired?
Measure the sensor's resistance value.
Charts on next 3 pages.
Error may only display every 3 minutes, during this time you may
see either "normal display" or "88" on indoor unit or wired control.
No
Yes
No
Is it a close
match to the
chart?
Yes
E4 / E5 – Sensor Problem
Dr. Smart Display (Debugger)
E60 / E61
If the sampling voltage is lower than 0.06V or higher
than 4.94V, the LED displays the failure.
• Wiring mistake
• Sensor faulty
• PCB faulty
Error to Sensor Location
E4 (E60) – T1 Return Sensor IDU
E5 (E61) – T2 Outlet Evap. Sensor IDU
Reseat/Reconnect
Sensor connections
and retest system
Replace sensor
Replace PCB Sensor
is connected to
If after parts
replacement, error is
still displayed, contact
your local CE Technical
Support Rep.
Continued on next page