TROUBLESHOOTING
The Eccotemp microprocessor control depends on the temperature information it receives from each
of the temperature sensors to detect water flow and maintain proper temperature. If any sensor or its
connection to the circuit board is bad, the Eccotemp may not turn on at all or if it does the temperature
may fluctuate. Whenever servicing a Eccotemp, the proper operation of the sensors and the circuit
board should
always
be verified regardless of the trouble code. Eccotemp recommends you follow the
pre- service checklist every time you service the unit to verify proper operation.
PRE- SERVICE CHECKLIST:
• Verify Installation:
• Verify proper plumbing, cold to the inlet and hot to the outlet.
• Verify flow rate matches the specifications of the unit.
• Verify the heater is mounted properly and level. INLET NIPPLES ARE ALWAYS AT THE TOP
OF THE UNIT WHETHER MOUNTED HORIZONTAL OR VERTICAL.
• Record the serial number in the event you need to contact Eccotemp Customer Service.
Tests with Power OFF
• Verify water flow through the heater. Check that shut off valves are in the open position.
• Check the plumbing and the unit for any signs of leaks.
• Check for any loose wires to the circuit board and verify the power connections are tight. If
stranded wire is used, check that all strands are inside the lug.
• Tests with Power ON
• Verify circuit breakers are turned on and verify power to the heater. Check the voltage at the
terminal block.
• Check the circuit board LED for any diagnostic codes. Visit http://www.eccotemp.com or contact
customer service for latest diagnostic code information.
HEATER TESTING – TEST WITH POWER OFF AND METER SET TO MEASURE RESISTANCE
COMPONENT
EXPECTED RESULTS
Temperature sensors
Readings should be taken after the heater has been cooled down so that the
temperature in the chamber is uniform. (Run water with power off for 3- 5
minutes) All sensor resistance measurements should be within 10% of the
others.
Heating Elements
Read across screws at the Red & Black wires. Typical readings are in the
range of 5 to 14 ohms but vary with wattage and voltage.
Moisture Detect Switch Should normally read open. If closed, check for water leaks or water on the
switch pad. Correct the leak, dry the switch and retest.
POWER ON TESTS (SHOULD ONLY BE PERFORMED BY A QUALIFIED TECHNICIAN)
COMPONENT
TEST
EXPECTED RESULTS
Incoming Power Lugs
Voltage
L1 to L2: 208-277 VAC depending on model; L1 to Neutral 110-
120 VAC (for 120V models).
Heating Element
Amps
Measure Amps on wires leading to element with water flowing,
Maximum reading at full power calculated as Watts/Volts.
Summary of Contents for EP-2.4
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