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How
to test water heater
wires
Do not touch electric water heater that is wet. Turn Poser OFF.
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 Larger image | Turn power OFF Open covers on water heater Remove insulation and plastic protectors Foam insulation might need to be cut back | ||
 | Power is OFF Tighten all screws very tight against copper wire Look for signs of high heat and burning. Look for melted insulation on wires. Look for burned or blackened wires. Use nose and smell for burning. | ||
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 Look for burned or melted wire Replace part Cut back wire Test continuity of wire/ or replace wire |
✔Inspection
of water heater finds burned wire: Power is OFF Action: Replace part that burned wire is connected to. Test continuity of wire that has been burned. Replace wire that has no continuity. How to test element. How to replace element How to test thermostat. (it is easier to replace both thermostats) How to replace thermostat How to wire thermostats |
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 Set multimeter to read ohms |
How
to test continuity of wire: When burned wire is discovered/ or bad wire is suspect Power is OFF Set multimeter to read ohms. Disconnect wires from each tank part. For example disconnect wire from thermostat and disconnect other end of wire from element. Test #1: Put tester leads on both ends of wire. If test reads ohms, then wire is good. Test #2: Test each end of wire to bare metal part of tank. If test reads ohms, then wire is shorted and must be replaced. Tanks with foam insulation may need to be replaced. |
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| Test wire between water heater and breaker box. Turn off breaker. Remove wires from top of heater. Re-test wires on tank. Test wire from breaker with breaker off. Test for continuity between each wire and each wire to ground. There should be no current flowing between any of the wires. Read | |||
 Melted wire will pass continuity test. If ECO keeps tripping, and thermostat is good, and water is not overheated, then replace wires inside tank. |
✔Breaker tripped, and now ECO is tripping: ✔Water heater had leak, and now ECO is tripping: Quick answer: Replace thermostats and test elements Inspect for burned parts and and loose wires: Replace burned part. ECO trips when wire is partially melted due to short or electrical overheat. Wire can no longer carry element wattage, causing heat that trips ECO. This happens if water heater leak caused short. Or if circuit breaker tripped. Or if water heater had a fire. Replace wires. New water heaters with foam insulation might require replacement. |
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 | Wire size too small for element. ✔Installed new element, and now ECO is tripping: Quick answer: Replace thermostats and test elements Inspect for burned parts and and loose wires: Replace burned part. ECO trips when wire gauge is too small for element wattage, causing heat that trips ECO. This happens if replacement element has greater wattage than shows on label on side of tank. Compare rating label on side of tank with wattage rating printed on end of each element. | ||
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Numbering
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Low water pressure |
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