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Problem Possible Cause Check or Remedy
Blower does not come on Bad connections on the plugs or
cable (P5-3,P5-4, P6-1)
F2 RELAY fuse on DAP III is blown
One of the manual override switches
is ON and the manual override for the
blower is OFF
Smoke detector alarm activated
Firestat temperature alarm activated
Faulty blower relay (K5)
Check connections. Use blower manual over-
ride switch to test
Replace with 8 amp fuse
Check manual override switches, make sure
they are all OFF and the manual override
switch fo the blower is ON. Manual override
mode
Reset the smoke detector
System is inhibited until return air tempera-
ture is below the fi restat limit (Menu 4-6)
Use manual diagnostic Relay Test to check
Refer to sub menu
9-3
Temperature sensor prob-
lem alarm is activated
Loose connections on P-8
Faulty sensor
Incorrect calibration
Check connections and cable, P8-4 & P8-5
Use sensor chart to check VDC of sensor
across P8-4 to P8-5 connector
Contact Data Aire Technical Support
Humidity sensor problem
alarm is activated
Loose connections on P-8
Power supply fault
Faulty sensor
Check connection and cable (P8-1, P8-2 and
P8-3)
Check for 5 VDC between P8-3 and P8-13
Use sensor chart to verify VDC between P8-2
and P8-3.
Compressor(s) do not come
on
No call for cooling
Cooling stages are in short-cycle time
delay period
Inhibited by no airfl ow alarm
Incorrect confi guration on compressor
menu
Loose connections on plug or cable
(P6-2 and P6-3)
F2 RELAY fuse of DAP III is blown
Panel is operating in manual override
and the compressor manual override
is not ON
Check temperature setpoint and deadband
Wait 5 to 10 minutes or reset panel
Correct for no airfl ow alarm
Check settings on sub-menu 5-4. Also make
sure unit is not confi gured for chilled water,
check sub menu 5-7
Check connection. Use compressor manual
override switches to test
Replace with 8 amp fuse
Check manual override switches
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