Aircommand IBIS ROOFTOP CARAVAN Manual - page 3
Page 2
Action (continued)
If the temp. differential is 14C or more but unit goes out on E4 after
approx. 30 minutes, please check the actual
thermistor temperature by the following procedure.
With the inside fan running on Hi.
Press Temp down button followed by the mode button.
Hold them both in for approx 5 seconds. The amber
Lock
LED
illuminates.
Now press the Temp down button and the Sleep button
Together for about 1 second. The green Med speed will be Flashing.
The
display is now reading the temp of the
outside
coil.
Now press the Temp up button once. The
Green Hi speed will be flashing.
The display is now
reading the temp. of the inside coil.
This temp will usually be from 5 to 12 C. If it is above 24C. It is another
indication of lack of refigerant. If on the other hand the air on /air off
differential is 14C or greater then suspect the thermistor itself to be out
of calibration. Check the thermistor as per an E1,E2 or E3 failure by
measuring its resistance. See fig 19 and referring to table 1.
E5 indicates excessive temp. of the outside coil if on cooling, OR excessive temp of the inside coil in
heat mode. On cooling, the E5 will appear if the outside coil temp exceeds 68C. This is an indication
of condenser airflow reduced or non-existent. Using the procedure described above it is possible to
watch the condenser coil temp using the
Temp down
button and
Medium fan speed
combination to
display this temp. NB: if fans etc seem to be OK then measure thermistor resistance and refer to table
12. In case the problem is thermistor calibration.
Action:
If unit is in cooling mode, examine both condenser fans are running. If
one is running then suspect a faulty motor. If both fans not running then
on units up to serial No. IBSA 01175, investigate the fan speed control
card located in enclosure on the LHS See fig 6.
If this checks OK then investigate main control card.
Fig 1, 2 or 3. Units with serial No’s IBSA01176 and
onward are multi speed tapped wound motors not requiring a speed
control card. If both motors inoperative then suspect main control card.
Fig 1, 2 or 3.
If unit is in heating mode, examine the indoor fan that it is free to rotate.
If fan is inoperative but free to rotate, then. Units up to S/N IBSA01175,
examine speed control card. See Fig 1. If OK then examine fan motor &
capacitor.
Winding resistance: Blue /Black approx 165
Ω
Blue / Brown approx 480
Ω
If after S/N IBSA01175, check winding resistance
Blue /Black 580
Ω
Blue /Grey 630
Ω
Blue /White 685
Ω
Brown/Yellow 785
Ω
If fan motor and capacitor check out OK then
change the main control board.
NB: When in Heat mode, at outside temps above 18C, the outside fan motors may cycle on and off .
This is the system-shedding load to avoid overheating the inside coil and is not a fault.
Error codes E6 & E7 are not utilised in this system. If either of these codes appear, then change the
main control board.