REV 8/03
20
PROBLEM POSSIBLE CAUSE CHECK OR REMEDY
MENU: FAIL Bad menu button (close) or
button is pressed when self-
test is proceeding
Turn panel off, clean and press on the
button couple times, make sure the button
works freely
SELECT: FAIL Bad menu button (close) or
button is pressed when self-
test is proceeding
Turn panel off, clean and press on the
button couple times, make sure the button
works freely
Blower does not come
on.
Bad connections on the plugs
or cable
Check connection from pin #4 of TB1 of
Mini-DAP II to pin #4 of unit.
Relay fuse of Mini-DAP II is
blown.
Check relay fuse on Mini-DAP. Replace
with 5 amp fuse if necessary.
Smoke detector alarm
activated (if used).
Reset the smoke detector.
Fire stat alarm activated. System is inhibited until return air
temperature is below the firestat limit
temperature, which is set on Menu #39.
Faulty blower relay K1. Use Manual diagnostic relay test #2 to
check. See above for Manual diagnostic.
Use AC voltmeter to check for 24 VAC
between pin #3 and #4 when blower relay
is called for.
Blower comes on then
goes off.
Fan mode is set for auto, not
continuous
See fan mode logic above then set a
desired fan mode on menu #43.
Temperature sensor fail. Loose connections Check connections on pin #17 and #18 of
TB2 on board.
Faulty sensor Refer to sensor chart to check VDC across
the temp sensor by applying DC voltmeter
across pin 17(+) and pin 18(-).
Incorrect calibration See Programming and selections, menu
#31 above for temp sensor calibration.
Loose connections Check connections on pin #19,20,21 and
22 for loose connection or incorrect wiring.
Faulty sensor. Check for 15 VDC between pin #19 and
#22 of TB2 on Mini-DAP II. Check for 5
VDC between pin #20 and #22 of TB2.
Refer to the sensor chart to verify VDC
between pin #21 and#22 of TB2.
Humidity sensor fail
Incorrect calibration See Programming and selections, menu
#35 above for hum sensor calibration.
Compressors do not
come on.
No call for cooling. Check temperature setpoint and deadband
(menu #4 and menu #28).
Cooling stages are in short-
cycle time delay period.
Wait 5 to 10 minutes or reset the panel.
See the cooling logic above.
Inhibited by high condensate
water or no airflow alarm.
Correct the alarms.
Incorrect configuration on
compressor menu.
Check setting on Menu #44. It should be
set at “PRI” for single compressor or
“PRI/PRI” for dual compressor unit and
“VALVE” for chilled water unit.
Loose connection on
connector or incorrect wiring.
Check connections between pin #5 of
Mini-DAP II to pin 5 of unit for cool 1 and
pin #6 of Mini-DAP II to pin 6 of unit for
cool 2
Relay fuse of panel is blown. Check Relay fuse on Mini-DAP II and
replace it with 5 amp fuse if necessary.
High pressure alarm goes off Reset the high-pressure switch. If it
happens again, contact a technician.
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