Marine Air Systems vector compact - Page 24

PASSPORT
CONT.
II DIGITAL CONTROL TROUBLESHOOTING GUIDELINES
FAULT
Fan is not
running.
Fan runs
continuously.
Fan is not
running but
compressor is.
Fan runs
continuously
although it is
set to cycle
w/compressor.
No cooling or
heating.
No heat.
Unit switches
to heat while in
cool mode.
Coil is iced.
POSSIBLE REASON
Passport II is programmed for
fan cycling with compressor.
Passport II is programmed for
continuous fan operation.
Failed triac on Passport II
circuit board.
Failed triac on Passport II
circuit board.
Passport II programmed for
heat or cool only.
"HHH" or "PPP" is displayed
on Passport II panel.
Electric heat option not
operating properly with
Passport II.
Electric heater thermal
overload is open or fuse is
blown.
Passport II de-icing feature
enabled due to coil icing up.
Improper air flow.
CORRECTION
Reprogram parameter U10 to 1 so fan will run
continuously while unit is on.
Reprogram parameter U10 to 0 for fan to cycle
with compressor.
Send for repair or call local service technician
(see back of book).
Send for repair or call local service technician
(see back of book).
Reprogram parameter Ul for appropriate mode:
cooling, heating or auto.
See below.
The Passport II circuit board has a 6 amp relay
for reverse cycle, if electric heat is installed, a
contactor must be used to carry the heater
current. Check wiring and see programmable
parameter Ull.
Check that fan is running properly while in heat
mode. Check fuse.
Reprogram parameter U15. If coil is iced, see
below.
Remove any obstructions in return air stream.
Clean return air filter and grille. Check for
crushed or restricted ducting, ducting must be as
straight, smooth and taut as possible.
Read Passport II programmable parameter U15
and reset. If de-icing cycle does not melt ice,
switch a/c to heat until ice melts or use hair
dryer to melt ice.
If problem persists program low fan speed
parameter U3 for maximum value (55).
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