Service & Sales
1-800-421-6150
www.wilburcurtis.com
Is the water level in the tank in contact with
the water level probe? If not, See TANK
FILLING ISSUES.
Yes:
No:
If the LCD does not read “Heating” verify cor-
rect Temperature programming, then replace
the Temperature Sensor.
Does the LCD read “Heating”?
Yes:
No:
No: Replace Reset Thermostat
Yes: Proceed to #5
Verify that there is 12 vac between pins 1 &
2 on the 14 pin connector at the UPM and
120 vac between pins 1 & 2 on the 12 pin
connector at the UPM.
No: Replace transformer.
Yes: Verify 5 vdc between pins 1 & 2 on the
4 pin connector at the Smart Card Module.
No: Replace UPM
Yes: Replace Smart Card Module
Verify that the panel breaker is turned on. If
okay, proceed STEP 2.
Verify that the voltage at the receptacle is
correct: L1-N = 120 vac, N-G = 0 vac. if
okay, proceed to STEP 3.
Verify that the toggle switch is turned on.
Verify 120 vac on both terminals.
No: Replace Toggle Switch
Yes: Proceed to STEP 4
Verify that there is 120 vac on both sides of
the Reset Thermostat, measuring between
L1-N.
TROUBLESHOOTING INSTRUCTIONS
1
4
2
3
POWER ISSUES
The LED light on the front door are not lit:
5
HEATING ISSUES
Verify 120 volts at the Heating Element. If
120 volts is present, replace the Heating
Element.
Verify 120 volts to the Triac Gate: If yes,
replace Triac. If no, replace UPM.
Not heating:
Overheating:
i
If the water in the tank is not in contact
with the probe – refer to tank filling issues.
The unit will not heat until the water in the
tank has contacted the probe.
Verify that resistance on temp Sensor reads
less than 10k ohm. Verify correct mounting
to tank. Replace sensor.
Check Triac for continuity between A1 &
A2. If continuity is present, replace Triac. If
there is no continuity, replace the UPM.
