TROUBLESHOOTING
SYMPTOM “A”: NO HEAT, INDICATOR LIGHT OFF
1) ELECTRIC SUPPLY IS OFF
Turn on the TWO main circuit breakers. Ensure the breakers are properly connected to the
relay. L1/L2 from one breaker must correspond with the same relay. You must be able to get
240V across each relay when powered up independently. Do not use space saving breakers.
2) NO OR LOW WATER FLOW
Ensure that the minimum flow rate to switch on your heater is met. “TC” Models minimum
flow rate = 0.70 gallons per minute. Also check that the inlet filter screen is clear from any
debris. This is located in the brass inlet boss.
3) WATER CONNECTIONS ARE REVERSED
Cold water inlet = right side, hot water outlet = left side.
4) ELEMENT BURNED OUT
TURN OFF THE TWO MAIN CIRCUIT BREAKERS!
Using an ohmmeter test the resistance of the heating element
across the two threaded termination rods on top of the element.
The resistance reading should be roughly 5.0 ohms. If the resistance
is much greater than this value, call Eemax for a replacement element.
5) ECO TRIPPED (High Limit Thermostat)
TURN OFF THE TWO MAIN CIRCUIT BREAKERS!
Reset by pushing in red button on each heater module. If the Eco was tripped it will re-engage.
SYMPTOM “B”: NO HEAT OR LOW TEMPERATURE WITH INDICATOR LIGHT ON
1) WATER FLOW TOO HIGH
Reduce the water flow by using an outlet ball valve. See specifacation sheet for temperature rise at
various flow rates.
2) INCORRECT POWER SUPPLY
Make sure that the unit is connected to the voltage supply specified on the rating label on the front
cover of the unit and no other.
3) ELEMENT BURNED OUT
TURN OFF THE TWO MAIN CIRCUIT BREAKERS!
Repeat the steps from paragraph 4 above.
4) ECO TRIPPED (High Limit Thermostat)
TURN OFF THE TWO MAIN CIRCUIT BREAKERS!
Reset by pushing in red button on each heater module.
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