T-H2-DV/T-H2-OS Service Manual
Ver. 1.01
22
10-4. Fan motor for exhaust
Unit Part # #124 Takagi Part # EKH5T Checkpoint G2
Function To control exhaust temperature.
Failure events
1. Fan speed failure, causing abnormal sounds with or without combustion
during operation.
2. Unexpected activation caused by the connectors of the fan motor getting
wet.
3. Disconnects from the exhaust chamber.
Effects on the water
heater if fan motor for
exhaust fails
1. The water heater does not function properly
2. Unstable exhaust gas temperature
Error codes when the fan
621 (T-H2-DV only) 941 (T-H2-DV only)
Diagnostic
1. Visual inspection: connection/breakage of wires or dust (causing electrical
shortage)
2. Voltage check: proper range of voltages shown below.
Color/Number of wires
Red-Blue 110 to 160 VDC (Input)
Yellow-Blue 13 to 17 VDC (Input)
Orange-Blue 2.0 to 6.5 VDC (Input)
White-Blue
Verify the fan motor speed for exhaust using the
Diagnostics Mode of the T-H2-DV computer board or the
TM-RE30 temperature remote controller. See Section 12-1
The fan motor for exhaust of the
T-H2-DV has the “46” mark as
shown the picture to the right.
5-7/8" (151mm)
3-1/4" (86mm)
46
5-3/8" (137mm)
"46" mark
Opening 1-3/4" ( 46mm)
To Next Page
Loading...
Need help?
General
