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When the flow requirements of the heat pump are satisfied, the flow switch should
register continuity, and it should report as open at insufficient flow.
Isolate the flow switch (disconnecting the wires from
the control board). With the pump running, test for
continuity through the switch. IF no continuity, replace
the switch (HPX20000-360005). IF continuity is present,
replace the main control board (HPXMCB50)
Isolate Flow Switch & Test
Step 5E
5. Error Code: E03 (cont.)
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