Mars Air Systems L-2254 - Manual (Page 14)

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English L-2254 Troubleshooting
2. Damaged jack/socket in display head or on
circuit board.
Visually check to see that pins inside socket are not
bent or corroded. Repair or replace display or circuit
board if needed.
Fault: “PLF” is displayed (Elite Digital
Control only).
Possible Reason/Correction
1. Indicates that seawater flow through the con-
denser coil is insufficient.
Check for adequate seawater flow. Verify pump
operation. Inspect the condenser coil, it may need
cleaning (see maintenance section). Sensor may be
faulty, replaced if necessary. Call for service tech.
MCP Mechanical Control Panel
Troubleshooting
Fault: Fan is not running.
Possible Reason/Correction
1. MCP system switch is not set properly.
Set MCP system switch to “START” for fan only or
“RUN” for cooling and heating (if reverse cycle).
2. MCP fuse blown.
Replace 10 amp fuse behind MCP panel
3. Wire became disconnected or loosened during
installation.
Reconnect or tighten, verify with wring diagram in
this manual.
Fault: System runs continuously.
Possible Reason/Correction
1. Improper MCP air sensor location.
Verify return air sensing bulb location with criteria
found in this manual.