Curtis D500GT30A000 [5/8] Heating issues

Curtis D500GT30A000 [5/8] Heating issues
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Check the voltage at the power block, it
should read: L1-L2 = 220v, L1-N = 120v,
L2-N = 120v, N-G = 0v.
Check the voltage at the reset thermostat, it
should read: between #1 & #3 = 220v and
between #2 & #4 = 220v.
Check the voltage at the toggle switch, it
should read: between #1 & #3 = 220v and
between #2 & #4 = 220v.
Check if there is 120v between pins #8 and
#16 on molex connector at UCM.
If all steps were taken and the unit still does
not turn on, replace the UCM.
Check if the panel breaker is turned on. If it
is, proceed to STEP 2.
Check the voltage at the receptacle if it
reads: L1-L2 = 220v, L1-N = 120v,
L2-N = 120v, N-G = 0v. Proceed to STEP 3
if accurate.
Check if the power cord is properly con-
nected to the receptacle. If it is, proceed to
STEP 4.
Check that the toggle switch is in the ON
position. If it is ON, proceed to STEP 5.
1
5
2
3
6
7
POWER ISSUES
The unit will not turn on:
4
8
9
HEATING ISSUES
i
Verify 220 volts between #2 & #4 on the
Manual Reset Thermostat. If no, reset or
replace the Manual Reset Thermostat.
Verify 220 volts across the Toggle Switch.
If no, replace the toggle switch.
Verify 220 volts across the Heating Ele-
ment. If yes, replace the Heating Element.
If no, verify 120 volts between the Triac
gate, Neutral, and L1. If yes, replace the
Triac, if no, replace the UCM.
Verify that the panel breaker is turned on
and the receptacle has 220 volts. If not,
consult an electrician.
Not heating:
Overheating/Steaming:
LCD reads “Heating”
Yes:
Yes:
Yes:
No:
LCD reads “Heating”
Verify that the resistance on the Temperature
Sensor is less than 10k ohms with a hot tank
(200+ degrees) If no, verify correct mounting
and that the walls of the tank are free of miner-
al deposits. If yes, bypass the sensor using a
jumper with a 5k ohm resistor. If the LCD reads
“ready” and the unit stops heating, replace the
temperature sensor, if not, replace the UCM.
LCD reads “Ready to Brew”
Check the triac for continuity across A1 & A2,
if continuity is present, replace the triac, if no
continuity, replace UCM.
Ensure that the temperature is adjusted to compensate
for high elevation. The factory setting is 200°F. The tem-
perature setting will need to be reduced Two degrees
for every one thousand feet of elevation.
TROUBLESHOOTING INSTRUCTIONS