Gecko MSPA-1-AS, Service Manual

Page: 21 / 63

Service manual 20
ERROR MESSAGES "Prh" Error Message
The "Prh" error message is displayed when a problem is detected with the
high-limit sensor: the system is constantly verifying if the sensed
temperature remains within normal range.
1• Remove the plastic cover and
verify if the high-limit sensor (the
sensor touching the heater
barrel) is properly connected
to the board.
3• Reconnect the sensor.
If the "Prh" message is still displayed,
replace the high-limit sensor by a spare
one and verify if the problem is
solved.
4• If the problem persists, replace the
board referring to the "How to
Replace the Board" section of this
manual.
2• Unplug the sensor connector
and try to clean the pins on the
board using a screwdriver (a
small coating of film may cause
a bad connection).
Press a key after each step to reset the system.