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WARNING: Inspection, testing and repair of electrical equipment should only be performed by a qualified service techni-
cian. Many of the tests require that the unit have power to it and live electrical components be exposed.
USE EXTREME CAUTION WHEN TESTING THE MACHINE.
Symptom
Low rinse temperature/low wash
temperature.
High rinse temperature.
TROUBLESHOOTING SECTION
Possible Cause
Low inlet water temperature.
Low gas pressure.
Improper circulation through system.
T-set needs adjustment.
Defective T-mid thermistor (Red LED light
may be flashing).
Defective control board (ECB).
T-set needs adjustment.
ECO failure. (Overprotection feature is
faulty and does not open at 210 F) (98.89
C).
15
Action
Ensure incoming water is 110 F (43.33 C) at
incoming point of machine, may need to
increase the set point of the supply water
heater.
Check gas supply pressure.
Ensure proper operation of combination gas
cutoff valve.
Ensure manual gas cutoff valve is open.
Check gas supply pressure.
Check for kinks in flexible gas supply line.
Check recirculating pump operation. Check
for obstructions.
Ensure set point is approximately 4.25 VDC.
Check Ohms reading is between 950 and
1150 Ohms when probe is at room
temperature. Check for frayed wiring.
Ensure connection to control board.
Perform auto-calibration. Ensure power
supplied to board is +12 VDC. Ensure green
LED light is flashing.
Ensure set point is approximately 4.25 VDC.
Remove wire from ECO terminal. If burner
unit turns off, ECO may be defective.
Replace ECO.
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