Troubleshooting:
F3: MAG CURR (Magnetron Current Low)
Replace K6 volt select relay.
U.S.
Intl.
Is the K6 mechanical
volt select relay in
good working order?
Is the oven International or U.S.?
NO
YESYES
YES
Reinstall all parts and
place the oven back in
service.
YES
YES
YES
YES
YES
Replace
affected parts.
Replace the
capacitor.
Replace the
high-voltage
diode.
Inspect/replace
wiring between
C-17, 18, or 19
and C-14 of the
control board
and terminals
A+B of the K8
relay.
Is voltage leaving the K2
anode relay on terminal 6?
Replace the K2 anode relay.
Replace the
magnetron.
Inspect/replace wiring between terminal 6 (K2) and
T1-1 (HV transformer), T1-2 (HV transformer; US
208 VAC or Intl.) or T1-3 (US 240V)
Replace the F3 fuse and verify the
operation of the interlock switches
(page 37).
YES
NO
NOYES
Remove and inspect the magnetrons
for discolored antennas or waveguide
contaminants. Were any defects found?
NO
Test the transformer (page 38). Is it
functioning properly?
NO
NO
Test the capacitor (page 37).
Is it functioning properly?
YES
Test the high-voltage
diode (page 38). Is it
functioning properly?
Replace the
transformer.
Inspect the oven for the following:
• Check door switches and door alignment and
adjust if necessary. See page 35 for more details.
• Update the Phoenix firmware (contact factory).
• Check the wear on the hinges and replace if the
roller bearing is worn.
• Verify the door springs are in working order.
• Inspect the wire harness for cut insulation or
exposed wire that could be grounding out.
Is the issue still present?
NO
NO
NO
NO
NO
NO
NO
Run test cook cycles to see if
fault repeats (page 11). If not,
clear faults. Did fault repeat?
YES
Confirm the F3 fuse is
a 15-amp ATMR fuse.
Is it open/blown?
Is primary voltage present at the
transformer (page 38)?
NEVER TEST SECONDARY
VOLTAGES
Energize the magnetron
circuit from Test Mode
(page 18). Are there 7+
amps present on the current
transformer wire, located on
the control board?
YES
YES
Replace the I/O
control board (Sage).
Are 7+
amps
present
during the
F3 fault
alarm?
Energize the magnetron circuit from
Test Mode (page 18) and test for
control voltage to the K2 anode relay.
Is 24 VDC present on pins C17, 18,
or 19; B-17; and C-14 on the control
board while energized?
Energize the magnetron circuit
from Test Mode (page 18) and
test for control voltage on the
K2 anode relay. Is 24 VDC
present on terminals A+B?
TROUBLESHOOTING
49
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