High pressure switch open (in
heating) due to improper air flow.
Clean return air filter and grille. Check for crushed
or restricted ducting, ducting must be as straight,
smooth and taut as possible. If problem persists
program low fan speed parameter U3 for
maximum value (55). Reprogram parameter U9 for
"1" to reverse fan speeds.
PASSPORT II DIGITAL CONTROL TROUBLESHOOTING GUIDELINES CONT.
FAULT POSSIBLE REASON CORRECTION
"PPP" is
displayed on
Passport II.
Low pressure switch is open due
to low sea water and/or low
return air temperatures.
Try restarting the a/c unit, the optional low pressure
switch has a ten minute time delay that may be in
effect.
Low pressure switch is open due
to loss of refrigerant.
Check a/c unit for refrigerant oil leakage, call
service technician (see back of manual).
System runs
continuously.
Improper Passport II air sensor
location.
Verify display head location with criteria found in
this manual. Install alternate air sensor if necessary.
MCP MECHANICAL CONTROL PANEL TROUBLESHOOTING GUIDELINES
FAULT POSSIBLE REASON CORRECTION
Fan is not
running.
MCP system switch is not set
properly
Set MCP system switch to "START" for fan only
or "RUN" for cooling and heating.
MCP fuse blown. Replace 10 amp fuse behind MCP panel.
No cooling or
heating.
High pressure switch is open (in
cooling) due to improper sea
water flow.
Strainer or intake may be plugged, sea cock may
be closed, check sea water hose for kinks or
collapses. Verify pump operation. Check pump
circuit breaker if applicable.
High pressure switch open (in
heating) due to improper air flow.
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.
System runs
continuously.
Improper MCP air sensor
location.
Verify return air sensing bulb location with criteria
found in this manual.
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