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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.
TROUBLESHOOTING SECTION
15
Possible Cause Action
Low inlet water temperature. Ensure incoming water is 110 F at incoming
point of machine, may need to increase the
set point of the supply water heater.
Low gas pressure. Check gas supply pressure.
Ensure proper operation of combination gas
cutoff valve.
Ensure manual gas cutoff valve is open.
Improper circulation through system. Check recirculating pump operation. Check
for obstructions.
T-set needs adjustment.
Ensure set point is approximately 4.25 VDC.
Defective T-mid thermistor (Red LED light
may be flashing).
Check Ohms reading is between 950 and
1150 Ohms when probe is at room
temperature. Check for frayed wiring.
Ensure connection to control board.
Defective control board (ECB). Perform auto-calibration. Ensure power
supplied to board is +12 VDC. Ensure green
LED light is flashing.
T-set needs adjustment.
Ensure set point is approximately 4.25 VDC.
ECO failure. (Overprotection feature is
faulty and does not open at 210 F).
Remove wire from ECO terminal. If burner
unit turns off, ECO may be defective.
Replace ECO.
Symptom
Low rinse temperature/low wash
temperature.
Check for kinks in flexible gas supply line.
High rinse temperature.