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240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
Error Code
Malfunction description
Cancellation method
761
Miscommunication between Parent and Child
units for Easy-Link systems
Restoring proper cable connections
among all the water heaters. When
the computer detects proper
connections among all the water
heaters, "761" error code will cease
to display.
Diagnosis
Check point
1 Inspect cable connections between Parent and Child units.
Normal: 15 VDC between (black-white) (during Easy-link operation)
2 Check for signs of power surges.
D1 and D2
Error Code
Malfunction description
Cancellation method
751
Miscommunication between water heater and
temperature controller (Direct Vent Indoor
models only)
When the computer detects
proper connections between the
water heater and the temperature
controller, "751" error code will
cease to display.
Diagnosis
Check point
1 Temperature controller or PCB fault
Normal: 11 to 25 VDC between (white-black)
2 Check for signs of power surges.
L