Troubleshooting - Curtis WB-14-12 Service Manual

TROUBLE SHOOTING
PROBLEM: WATER WILL NOT REFILL
POSSIBLE CAUSE
1. Water line closed or
clogged filter
2. Valve coil burned out
3. Grounded probe
4. Defective water level
control board
PROBLEM: WATER OVERFLOWING.
POSSIBLE CAUSE
1. Defective water inlet
valve
2. Liquid level probe
limed up
3. Non-grounded or loose
terminal connections
at liquid level control
board
PROBLEM: WATER DOES NOT REACH PROPER TEMPERATURE
POSSIBLE CAUSE
1. Thermostat is turned
OFF (or set too low)
PROBLEM: WATER OVERHEATS, ELEMENTS DO NOT SHUT OFF
POSSIBLE CAUSE
1. Defective thermostat
4
Check the water system at your facility to make sure the line is open. Replace the water filter.
Turn machine off. Disconnect wires from water inlet coil terminals and connect a power cord to
the terminals. Plug cord into a 120V outlet and verify if water flows when plugged in and stops
when power is disconnected. If valve fails this test, replace valve.
When the water level gets below the probe tip, water should automatically refill the unit. If not, pull
wire off the probe terminal. Water should now start flowing into the water boiler.
Disconnect wire from probe terminal. With a voltmeter, check voltage at the water inlet coil termi-
nals. This should read 110-120 volts. If no voltage is present, check liquid level control (L.L.C.)
board. Make sure the L.L.C. board is supplied by 120V across terminals NEU and L1 120V. The
L.L.C. board is grounded to the body of the machine by contacting the board to the mounting
bracket. Make sure board is grounded here. Check for loose connections at terminals. Replace
the L.L.C. board.
Turn power off and observe water level. If water continues to flow into the heating tank, clean or
replace leaky valve.
Disconnect the wire from probe terminal and touch the body of the heating tank with the terminal at
the end of this wire. If the flow of water stops, there is an issue with the probe. Clean the probe and
reconnect the wire. If water continues to flow, replace the liquid level probe.
Liquid level control board must be securely grounded through the back of the board and the mount-
ing bracket. Check for loose connections at the terminals. Check for voltage across the inlet valve
terminals. If there is 110 to 120 volts present at the inlet valve terminals when water level is touching
the probe tip, replace the L.L.C. board.
Check the thermostat adjustment to make sure the knob is rotated clockwise to the desired tem-
perature setting.
Replace the thermostat. You can sometimes operate temporarily by turning the thermostat knob
to off until the boiling stops.
SOLUTION
SOLUTION
SOLUTION
SOLUTION