ComNav P4 Installation and Operation Appendices
Document PN 29010100 V1r0 - 177 -
The following messages indicate a serious problem. Operation of the autopilot cannot
continue until the problem is resolved.
The auxiliary Control Head or Handheld Remote
connected to the SPU are not compatible with the
autopilot system. Typically, this is caused by using
Heads or Remotes with firmware versions that are
incompatible with that of the SPU.
Contact your ComNav Dealer for a Firmware Upgrade.
Battery voltage has risen above ~40 VDC.
Check all wiring and charger systems.
The main Control Head is not responding to the SPU.
Check all wiring.
Fuse F2 on the SPU has blown. This fuse supplies
current to the drive outputs.
Check all wiring and verify that all output loads
(solenoids, pump motors, etc) are within the
specifications given for the SPU.
Replace the fuse with the same type only.
The P4 has detected that the battery supply voltage is
less than ~10 VDC, which is too low to continue safe
operation.
Check all wiring as well as the battery/batteries.
The P4 has detected a problem in its program memory.
Return the unit to your ComNav Dealer for repair.
The P4 cannot detect the presence of a Rudder
Follower Unit.
Check all RFU wiring. If no faults are found, the RFU
may be defective.
Contact your ComNav Dealer for repair advice or
replacement.
Table 12 – Critical Error Messages
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