Curtis C1000AP Service Manual page 7

C1000AP & C1000APT Airpot Brewer
TROUBLE SHOOTING CONTINUED:
PROBLEM: WATER IN TANK DOES NOT REACH PROPER TEMPERATURE
POSSIBLE CAUSE
4. Burned out heating element
PROBLEM: WATER BOILING, HEATING ELEMENTS DO NOT SHUT OFF.
POSSIBLE CAUSE
1. Defective thermostat
2. Defective contactor
PROBLEM: WATER NOT FLOWING FROM SPRAYHEAD.
POSSIBLE CAUSE
1. Water level is too low in heating
tank.
2. Defective brew switch
3. Defective brew valve
4. Clogged fittings or tubing
In this coffee brewer there are two elements in parallel. Failure of either will cause very
slow heating. Perform the following tests:
a. Clamp-on ammeter test: If both elements are good, you will measure about 21
amps at 240 volts or 24 amps at 208 volts. Use heavy wire from the contactor to
measure the current. If you measure only 10 to 12 amps, check the current to each
element to identify defective unit.
b. Ohmmeter or continuity test: Disconnect all power by unplugging unit, or de-en
ergizing circuit breaker (switch on back of unit does not disconnect L2). Disconnect
one terminal to measure each element. They should each have continuity or mea-
sure about 20 ohms.
If ready to brew light does not come on, replace thermostat. You can sometimes operate
temporarily by turning the thermostat shaft counterclockwise until brew light comes on
and boiling stops.
If READY TO BREW light comes on, but water keeps boiling, contactor is stuck. Replace
it. Under this condition, no voltage should be present at the contactor coil.
Check water level in tank (it should be filled up to the probe tip). If water does not flow
into tank, review steps 1 thru 4, previous page.
Check the continuity between terminal 4B & 5B. When the switch is pressed, there
should be solid continuity between these two terminals. If not, replace the switch.
Push the brew switch to start the timer. The light on this switch will indicate that the timer
is on and it will energize the coil of the dump valve to open it. You should read 110/120V
at the coil terminals. If this voltage is present but the valve does not open, the coil is
burned out. Replace the coil or the valve.
Check for lime buildup in the tank outlet fitting, sprayhead fitting, or the sprayhead. Clean
as necessary. Also check for kinks or blockage in the flexible tubing.
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SOLUTION
SOLUTION
SOLUTION