Troubleshooting Guide (General) - Curtis Primo Cappuccino Next Generation 4 User Manual

TROUBLESHOOTING GUIDE
WARNING:
Electric Shock Hazard - the following procedures are to be performed only by a qualified service
technician. Disconnect power when replacing components. Neither Wilbur Curtis Co., Inc. nor the seller
can be held responsible for the interpretation of this information, or any liability in connection with its use.
Scald and Burn Hazard - keep body parts clear of hot surfaces during troubleshooting.
IMPORTANT: If it is necessary to replace the universal power module (UPM), always check all inlet and
dump valve coils for a short and replace the valve as necessary, before replacing the module. See the
Valve Test Procedure, below to test for defective valves.
Troubleshooting Guidelines
• If an error message appears on the display, consult the ERROR CODES section before troubleshooting.
•
A dispenser that is not level may not function properly. Make sure the unit is properly leveled before
proceeding.
•
This troubleshooting guide identifies some, but not all, of the possible causes for common problems that can
occur.
• Use this troubleshooting guide along with the appropriate ELECTRICAL SCHEMATIC.
Valve Test Procedure
Use a digital multi-meter to measure the resistance of valve coils.
Measure the resistance across the valve coil terminals with the wiring harness disconnected. Reverse the meter
leads on the terminals and measure the resistance in the opposite direction. A resistance of less than 100 ohms,
in either direction, indicates a shorted coil. The valve must be replaced.
If a shorted coil is not detected, test for an open coil:
1
Reconnect the valve terminals to the wiring harness.
2
Power up the dispenser with the appropriate cover(s) removed to allow access to the valve.
3
Run a dispense cycle while monitoring the voltage at the valve coil terminals. If voltage is present on the
terminals, you should hear the valve click open/closed at the moment power is applied or removed from the
terminals. The inlet valve should open any time the water tank is not full. If the valve does not open, replace the
valve. If voltage is not detected, first check the wiring. If the wiring is OK, replace the UPM.
Water Not Hot Enough
1
If the water heats, but is not hot enough, first check for the correct temperature setting on the control panel.
Reprogram as necessary.
2
If the temperature setting is OK, but the actual water temperature does not match the setting on the control panel,
replace the temperature sensor
Water Heats More Slowly Than Usual
1
Check for power across the terminals of the heating element(s). If power is being supplied, disconnect the heating
element(s) and check for continuity. Replace a heating element if the resistance is too high (nominal resistance is 13
Ohms).
2
If there is no power to the heating element(s), check the wiring to any element that does not have the proper
voltage across it. Also check for corroded connections anywhere between the power cord and the heating
element(s).
.
TG53