Steffes DLF40B - Manual (Page 33)

Troubleshooting Information
(cont'd)
32
B. PROBLEM: FURNACE WILL NOT CHARGE (FURNACE HAS NO CORE CHARGE)
Check power company load control switch
& furnace "OFF­PEAK" light on the charge
control circuit board (30) for proper
operation. Continue following
procedures in off­peak mode.
Check "outdoor temp
SENSOR" lights on the
charge control circuit
board (30).
Check "ETS CHARGING"
light on the charge control
circuit board (30).
Check for 24VAC on
orange wire going to the top
staging sequencer (24).
Check for
defective charge
sequencers (26) and
for defective heating
elements (17).
Check unit wiring
and/or replace
charge control
circuit board (30).
Check for 24 VAC between each of the two
bottom 3­amp low voltage fuses and the room
thermostat connection "C" terminal block
position on charge control circuit board (30).
Lights Inoperable
Lights
Operable
Off
On
Voltage Present No Voltage
Jump charge control thermostat
(32) brown lead to charge
control thermostat orange lead.
Replace charge control
circuit board (30).
Replace charge
control thermostat
(32). (NOTE:
Make sure charge
control thermostat
shaft is in the full
clockwise position.)
Check outdoor temperature.
Set the "AUTO/HIGH/LOW"
toggle switch on charge
control circuit board (30) to
high position.
Check supply
voltage to the
control
transformer(s) (28)
and unit wiring.
Set the "AUTO/HIGH/LOW" toggle switch to "AUTO" and the
"SUMMER/WINTER" toggle switch to "WINTER" positions on the
charge control circuit board (30):
1. Remove outdoor sensor wire connected to the "G" terminal
position. "Outdoor temp SENSOR LEVEL 1" light should be "ON".
2. Remove outdoor sensor wire connected to the "B" terminal
position. "Outdoor temp SENSOR LEVEL 2" light should be "ON".
Replace charge control
circuit board (30).
Retest.
One or More
Lights on
No
Lights
Charge Light
"OFF"
Charge
Light "ON"
Below 55 o F
Outdoor
Temperature
Above 55 o F
Outdoor
Temperature
Voltage Not Present
On One or Both
Both Fuses
Energized
Repair wiring.
Check secondary
voltage from control
transformer(s) (28).
Ok
Defective
Replace outdoor air
temperature sensor (64).
Replace charge control
circuit board (30).
Ok Defective
Replace 24 VAC control
transformer(s) (28).
Replace charge control
circuit board (30).
No Voltage
Ok
Jump orange leads
to the auxiliary
control board.
Charge Light
"OFF"
Go to Auxiliary Control Board 1302038
­ Furnace Will Not Charge Continued.
Charge
Light "ON"