Eco Continuity Test - State Water Heaters 120 Series Service Handbook

TABlE 4
water temperature
celsius
3°
21°
38°
49°
55°
60°
71°
82°

eco continuity test

1. Turn off power to the water heater at the water heater's on/off switch.
2. Remove the top cover on the water heater, see Figure 3 on page 8.
3. disconnect the four pin plug from the Temperature Probe outside the CCB enclosure on the left, see
Figure 35 below.
4. Ensure tank temperature is less than 100°F (38°C) - dump water to lower tank temperature if necessary.
5. using an ohm meter set the range for continuity testing.
6. Check continuity between the two outside pins (red wires) of the plug end from the Temperature Probe,
see Figure 35 below.
Results/Actions
• If the ohm meter shows continuity (closed circuit) between the two outside pins (red wires) the ECo
switch has reset properly. If the Control System continues to lock out displaying Energy Cut Out
(ECO) on the LCd with continuity through the ECo present call the toll free support phone number
listed on the back cover of this manual for further assistance.
• If the ohm meter shows no continuity (open circuit) between the two outside pins (red wires) and the
tank temperature is known to be at or below 100°F (38°C) - replace the Temperature Probe. Follow
the draining and filling instructions in the maintenance section of the Instruction Manual that came
with the water heater when replacing the Temperature Probe.
• If the Control System continues to lock out displaying Energy Cut Out (ECO) on the LCd and the
water temperature inside the water heater is becoming excessive (at or above 201°F/94°C) check
water system piping; ensure heat is not being added by any other heating appliances or heat sources.
If all these tests have been performed and the Control System continues to lock out call the toll free
support phone number listed on the back cover of this manual for further assistance.
36
fahrenheit
40°
70°
100°
120°
130°
140°
160°
180°
Figure 35
Servicing should only be performed by a Qualified Service Agent
temperature sensor
resistance in ohms
26,435
11,974
5,862
3,780
3,066
2,503
1,698
1,177