20
5. Using an ohm meter set the range for continuity testing.
6. Check continuity between the two outside pins (red wires/Pins 2 & 3) of the plug end from the Temperature Probe, see Figure on Page
20 pin layout.
Results/Actions
• If the ohm meter shows continuity (closed circuit) between the two outside pins (red wires/Pins 2 & 3) the ECO switch has reset
properly. If the Control System continues to lock out displaying Energy Cut Out (ECO) on the UIM with continuity through the ECO
present call the toll free support phone number listed on the back cover of this manual for further assistance.
• If the ohm meter shows no continuity (open circuit) between the two outside pins (red wires/Pins 2 & 3) and the tank temperature is
known to be at or below 100°F (38°C) - replace the Temperature Probe. Follow the draining and lling instructions in the
maintenance section of the Instruction Manual that came with the water heater when replacing the Temperature Probe.
• If the Control System continues to lock out displaying Energy Cut Out (ECO) on the UIM and the water temperature inside the
water heater is becoming excessive (at or above 201°F/94°C) check water system piping; ensure heat is not being added by any
other heating appliances or heat sources. If all these tests have been performed and the Control System continues to lock out call
the toll free support phone number listed on the back cover of this manual for further assistance.
Figure 13. Temperature Probe Pin Layout
9. TEMPERATURE PROBE OPEN
ADVANCEDBACK
Tem p Probe (Open)
0 days 0 hrs 0 mins ago
Error Code: 48-
0
The indicated temperature Probe
may be shorted or open. Check
connector and resistance of
Probe.
CAUSES:
• The Temperature Probe appears to be open (very high
resistance). This fault code often means the connector
has been corroded by cleaning chemicals or other
substances.
CHECK/ REPAIR:
• Make sure connector is clean and tight.
• Check probe’s resistance.
• Replace the Temperature Probe if open (resistance exceeds 56,000 Ohms). See 8. Temperature Probe Short (page 18).
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