ISSUE RESOLUTION
F1: Blower Running
Status Bad
Motor
not running
when commanded.
1. Status Indicator “A” is highlighted/backlit in TEST MODE.
Verify 208 or 240 (USA) / 230 (Intl) / 200 (Japan) / 220 (Latin America)
VAC is going to the motor controller via pins 2 and 3.
o
208/240/230 VAC is present: Verify control wiring from the motor
controller and I/O control board, specifically low-voltage wire OR-9.
If all wires are OK, then refer to page 50 for motor
controller
troubleshooting.
o
208/240/230 VAC is not present: Correct wiring going to the motor
controller. Also, check fuses.
2.
Status Indicator “A” is still highlighted in TEST MODE.
Refer to page 50 for motor controller troubleshooting.
F3: Magnetron Current
Low
1. Ensure the K2 mechanical relay is in good working order.
If relay is OK, refer to pages 34-35 (
F3: MAGNETRON CURRENT LOW) for
detailed troubleshooting.
F8: Heat Rise Low
NOTE
: This message
occurs in
WARM UP and
SELF TEST if the oven fails
to warm up in the prede
-
ter
mined time period.
1.
Verify the high-limit thermostat is not tripped.
o
If high-limit is tripped, reset and allow the oven to warm up.
o
If high-limit is not tripped, proceed to instructions below.
High-limit thermostat is not tripped:
Check both K4 and K5 SSRs by activating them in
TEST MODE (activate
HEATER
and
IR ELE). When actuated, the (-) control input of the SSR will
go to 0.00 VDC.
When the relay is not actuated, the input will read
-24.00 VDC.
o
If the control voltage is not pulled down during actuation, verify
the wiring between SSR and I/O control board. Replace SSR if wiring
is OK.
o
If the control voltage is pulled down: Refer to Figure 37 on page 47.
THE CONTROL SYSTEM
22
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