Sinclair SCV-750EB Service Manual page 136

5.31 HC troubleshooting
Digital display output
Description
HC indicates high pressure sensor error

All units stop running.

Error code is only displayed on main PCB and user interface.

Possible causes
Pressure sensor damaged
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Main control board damaged
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Procedure
Pressure sensor
Replace main control board
Note:
1． For SCV-750EB and SCV-1400EB, pressure sensor connection is port CN40 on the main PCB (labeled 20 in Part 4, 2.2.1 Main PCB component). Measure the
resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has failed.
2． For SCV-900EB and SCV-1800EB, pressure sensor connection is port CN16 on the main PCB (labeled 30 in Part 4, 2.2.1 Main PCB component). Measure
the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has failed.
134
HC
1 damaged
No
Yes
Replace high pressure sensor