Rheem 871018 Service Instructions Manual page 13

In addition to the signal loom it will also be necessary to replace:
Inlet thermistor, Pt Nº 20-64773-00 (item 717)
Heat Exchanger thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Outlet thermistor, Pt Nº 20-64774-00 (item 713)
Overheat Limiter, Pt Nº 31-79562-00 (item 701)
Flow Sensor, Pt Nº 20-43805-00 (item 723)
Heat Exchanger Thermistor (item 715)
The heat exchanger thermistor is now part of the signal loom (item 758). In replacing the
loom the connectors on the replacement loom will now not fit any of the thermistors, water
flow sensor or overheat limiter requiring replacement of those items as well.
Old Part Number WH0020053 / New Part Number 31-76655-00 (signal loom)
In addition to the signal loom it will also be necessary to replace:
Inlet thermistor, Pt Nº 20-64773-00 (item 717)
Ambient air thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Outlet thermistor, Pt Nº 20-64774-00 (item 713)
Overheat Limiter, Pt Nº 31-79562-00 (item 701)
Flow Sensor, Pt Nº 20-43805-00 (item 723)
Inlet thermistor (item 717)
Old Part Number WH0020180 / New Part Number 20-64773-00
In addition to the inlet thermistor it will also be necessary to replace:
Signal Loom, Pt Nº 31-76655-00 (item 758)
Ambient air thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Heat Exchanger thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Outlet thermistor, Pt Nº 20-64774-00 (item 713)
Overheat Limiter, Pt Nº 31-79562-00 (item 701)
Flow Sensor, Pt Nº 20-43805-00 (item 723)
Outlet Thermistor (item 713)
Old Part Number WH0020181 / New Part Number 20-64774-00
In addition to the outlet thermistor it will also be necessary to replace:
Signal Loom, Pt Nº 31-76655-00 (item 758)
Ambient air thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Heat Exchanger thermistor, now part of the signal loom Pt Nº 31-76655-00 (item 758)
Inlet thermistor, Pt Nº 20-64773-00 (item 717)
Overheat Limiter, Pt Nº 31-79562-00 (item 701)
Flow Sensor, Pt Nº 20-43805-00 (item 723)
TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
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