Rheem 310 Series Service Instructions Manual page 44

Fault Finding – Chart 7
7
Disconnect the wiring to the
compressor and megger
between each compressor
terminal and earth.
Disconnect the wiring to the
fan motor at the terminal
block and megger between
each fan wire and earth.
Disconnect the wiring to the
element at the thermostat
and megger between each
element wire and earth.
Disconnect the remaining
wiring from the thermostat
and megger between each
thermostat terminal and
earth.
Disconnect the wiring plug to
the circulator at the control
board and megger between
each circulator wire and
earth.
Disconnect the power supply
wiring to the control board at
the terminal block and
megger between each control
board wire and earth.
TM025 Rheem Heat Pump Service Instructions REV: B
Date of Issue: 02/08/07
This document is stored and maintained electronically by
Blowing fuse/circuit breaker
Note: The control board has an internal resistor that will provide a Megaohm reading of
0.66 Megaohms when an insulation test is conducted on the control board or the
appliance with control board connected.
NO
NO
NO
NO
NO
reading below 0.66
Service. All printed copies not bearing this statement in RED are deemed "uncontrolled".
Is the
reading below 1
Megaohm?
Is the
reading below 1
Megaohm?
Is the
reading below 1
Megaohm?
Is the
reading below 1
Megaohm?
Is the
reading below 1
Megaohm?
Is the
Megaohms?
NO
43
YES Replace compressor.
YES Replace fan motor.
YES Replace element.
YES Replace thermostat.
YES Replace circulator.
YES Replace control board.
Check for pinched or
damaged wiring touching
the heater jacket.