Robinair 17801B Recovery, Recycling, Recharging Unit - Manual (Page 48)

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EVACUATION OPERATION
Vacuum pump will not start
Problem: Power cord is not plugged in, or there is no power at plug.
Solution: Check circuit for power.
Problem: The pressure in the A/C-R system is too high.
Solution: Recover the remaining A/C-R system charge.
Problem: “U-HI” message on digital display.
Solution: Recover all refrigerant before pulling a vacuum.
Problem: Vacuum time not entered.
Solution: Program the required time for vacuum.
Vacuum pump runs, but low-side gauge does not register an
appropriate vacuum
Problem: Low-side valve is closed.
Solution: Open the low-side valve.
Problem: Pump oil is contaminated.
Solution: Flush and change the vacuum pump oil.
Problem: Hose connection is loose, or manifold is leaking.
Solution: Check connections.
CLEARING OPERATION
“CLR” displays on screen
Problem: Pressing HOLD/CONT does not clear the display.
Solution: Slide the lockout panel on the back of the unit to expose the fittings
for the correct refrigerant type. Connect the appropriate hoses, and
perform a clearing procedure (see Step 12 in Setup Instructions).
Troubleshooting