a. Remove main furnace door.
b. Remove blower access panel.
c. Manually close blower access panel door switch.
Blower access panel door switch opens 24-v power to control
center. No component operation can occur. The 115-v power
is still present at control center and transformer. Caution must
be taken when manually closing this switch for service
purposes. Failure to follow this warning could result in
personal injury or death.
d. BRIEFLY short (jumper) TEST, 1/4-in. quick-connect
terminal on control center (adjacent to LED diagnostic
light) and Com terminal on thermostat connection block.
(See Fig 14.)
NOTE: If TEST to Com terminals are jumpered longer than 2 sec,
LED will flash rapidly, and retrieval request will be ignored.
e. Component Test will function as described in item 2.
above.
f. Check LED status.
g. If LED status indicates proper operation, release blower
access panel door switch, replace blower access panel, and
replace main furnace door.
58MVP FURNACE
For an explanation of fault codes, refer to service label located on
back of main furnace door or Fig 21.
The control center stores all fault codes for a period of 5 "good or
proper" operating cycles, regardless of 115- or 24-v power
interruption.
NOTE: Removing blower access panel will open blower access
panel door switch and terminate 24-v power to control center.
Look into blower access panel sight glass for current LED status.
1. To retrieve fault code proceed with the following:
NOTE: NO thermostat signal may be present at control center
and all blower time delay off periods must be completed.
a. Leave 115-v power to furnace turned on.
b. Remove main furnace door.
c. Look into blower access panel sight glass for current LED
status.
d. Remove blower access panel.
e. Turn setup switch SW-1 to ON position. (See Fig 15 or 22
for location.)
f. Manually close blower access panel door switch.
Blower access panel door switch opens 24-v power to control
center. No component operation can occur. The 115-v power
is still present at control center, transformer, inducer motor,
and main blower motor. Caution must be taken when manu-
ally closing this switch for service purposes. Failure to follow
this warning could result in personal injury or death.
g. LEDs display last fault code to occur first, followed by any
other fault that has occurred in the last 5 "good or proper"
cycles. The remaining faults displayed will be in numerical
order starting from the lowest number first. Only 1 of each
fault code will be displayed, regardless of how many times
the fault has occurred.
h. Fault code display will continue and repeat as described
above or until setup switch (SW-1) is turned off.
i. Release blower access panel door switch and replace
blower access panel.
j. Operate furnace through 1 heat cycle to test for proper
operation and check LED status.
k. If furnace is operating properly and LEDs indicate proper
operation, replace main furnace door.
2. Fault code display can be removed from control’s display
mode by performing the following. This is also called the
"Clean Up Procedure."
a. Leave 115-v power to furnace turned on.
Fig. 13—Field Wiring
A93049
10
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