
Troubleshooting
MPC Open XP
MPC Open XPIO48/816
CARRIER CORPORATION ©2019
Installation and Start-up Guide
All rights reserved
32
You can order replacement 3 Amp Pico fuses from a local or online retailer.
Before replacing the fuse, try to determine why the fuse blew.
•
Check the Power wiring polarity of the MPC Open XP, any attached expanders, and any other controllers that
share the power supply. Use the same polarity for all of them.
•
Verify that outputs are wired to the appropriate types of devices. See
Outputs
(page 15). For example, you
cannot wire a 24 Vac device to an output.
•
MPC Open XP
- If the
Aux Power Out
port is used, verify that it is wired correctly. See
To wire inputs and
outputs
(page 16).
To replace the fuse:
1
Turn
off
the MPC Open XP's power.
2
If the fuse is on an expander, remove the coverplate.
3
Using needle-nose pliers, pull the bad fuse from the MPC Open XP.
4
Cut the wires on the new fuse so that the total length is approximately 1 inch and the fuse is centered.
1 inch
5
Bend the wire ends so that the length is approximately 1/2 inch.
inch
2
1/
6
Use the pliers to grip one wire end of the fuse and push into a fuse socket on the MPC Open XP.
7
Grip the other wire end of the fuse and push into the other fuse socket.
8
If working on an expander, replace the coverplate.
9
Turn on the power and verify that the Power LED is lit.