Service Manual

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High Limit Control (ECO) Operation
Switch Contacts:
 Normally closed
 Open on rise @ 196°F ±4°F
 Manual Reset
1. Determine if High-Limit has actuated. This can be done by
simply depressing the reset buttons. If you hear and/or feel
a small click, the switch has actuated.
2. Use caution and turn power on to water heater and
observe heating cycle following the High-Limit Heating
Cycle flow chart
.
High Limit Heating Cycle Flow Chart
High Limit Control Continuity Testing
1. STOP, DANGER! Turn power “OFF” to water heater.
2. Water temperature must be below 196°F ±4°F
3. Remove High-Limit switch from control panel. It is not
necessary to remove immersion bulb from tank at this
time. See general controls layout on page 4 for location.
4. Disconnect wire leads to High-Limit Control.
5. Depress reset buttons to insure switch contacts are closed.
6. Set multi-meter to “ohms” setting. Check continuity through circuit A & B as shown in the diagrams below.
- Continuity IS present, switch is okay.
- Continuity NOT present, replace switch.
Is water temp
over 196°F?
Switch OK
Replace switch
Is water temp over
196°F?
N
Observe heaƟng cycle.
Does the switch open?
N
Circuit “A” ConƟnuity TesƟng
Circuit “B” ConƟnuity TesƟng
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