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035-19592-001 Rev. C (0204)

Unitary Products Group

7

CONTINUOUS FLASH:

 This indicates that flame was sensed when

there was not a call for heat. With this fault code the control will turn on
both the inducer motor and supply air blower. A gas valve that leaks
through or is slow closing would typically cause this fault.

2 FLASHES:

 This indicates that the normally open pressure switch

contacts are stuck in the closed position. The control confirms these
contacts are open at the beginning of each heat cycle. This would indi-
cate a faulty pressure switch or miswiring.

3 FLASHES:

 This indicates the normally open pressure switch contact

did not close at the beginning of the heat cycle. This could be caused
by a number of problems faulty inducer, blocked vent pipe, broken pres-
sure switch hose or faulty pressure switch.

4 FLASHES:

 This indicates that a primary or auxiliary limit switch has

opened its normally closed contacts. With this fault code the control will
operate the supply air blower and inducer. This condition may be
caused by: dirty filter, improperly sized duct system, incorrect blower
speed setting, incorrect firing rate or faulty blower motor.

5 FLASHES:

 This fault is indicated if the normally closed contacts in the

rollout switch opens. The rollout control is manually reset. If it has
opened, check for proper combustion air, proper inducer operation, and
primary heat exchanger failure or burner problem. Be sure to reset the
switch after correcting the failure condition.

6 FLASHES:

 This indicates that after the unit was operating, the pres-

sure switch opened 4 times during the call for heat. If the main blower is
in a “Delay on” mode it will complete it, and any subsequent delay off
period. The vent motor continues to operate until the pressure switch
re-closes or a call for heat is removed.

7 FLASHES:

 This fault code indicates that the flame could not be

established. This no-light condition occurred 3 times (2 retries) during
the call for heat before locking out. Low gas pressure, faulty gas valve,
faulty hot surface ignitor or burner problem may cause this.

8 FLASHES:

 This fault is indicated if the flame is lost 5 times (4 recy-

cles) during the heating cycle. This could be caused by low gas pres-
sure or faulty gas valve.

9 FLASHES:

 Indicates reversed line voltage polarity. Both heating and

cooling operations will be affected. Check polarity at furnace and
branch.

11 FLASHES:

 This fault will be indicated if the rollout jumper wire con-

nection soldered into the board is broken. If this fault occurs the control
will have to be replaced. This fault may also occur in installations where
an improper ground is present. Prior to replacing control, verify that unit
is properly grounded.

STEADY ON: 

This fault occurs if the gas valve is energized when there

is no call for heat. If this happens the vent motor is energized and will
remain energized for 5 seconds or until the fault clears itself at which
point the vent motor de-energizes. This failure is counted as a recycle.
Check the gas valve and control for proper operation.

60-MINUTE AUTOMATIC RESET FROM LOCKOUT:

 This control

includes a “watchdog” type circuit that will reset from a lockout condition
after 60 minutes. Operational faults 1,6,7,8 and Steady On will be reset.
This provides protection to an unoccupied structure if a temporary con-
dition exists causing a furnace malfunction. An example would be a low
incoming gas supply pressure preventing unit operation. When the gas
pressure is restored, at some point the “watchdog” would restart the
unit and provide heat for the house.

NOTE: 

If a flame is detected the control flashes the LED for 1/8 of a

second and then enters a flame stabilization period.

Never bypass pressure switch to allow furnace opera-
tion. To do so will allow furnace to operate under poten-
tially hazardous conditions.

Do not try to repair controls. Replace defective controls
with UPG Source 1 Parts.

Never adjust pressure switch to allow furnace operation.

IGNITION CONTROL (P/N 031-01972-001)

Normal flame sense current is approximately

3.7 microamps DC (µa)

Low flame signal control lockout point is

0.9 microamps DC (µa)

 FIGURE 8: 

Furnace Control Event Schedule

Thermostat Calling for Heat

Thermostat Satisfied

(Seconds)

THERMOSTAT

INDUCER

IGNITOR

MAIN VALVE

HUMIDIFIER

ELECTRONIC
AIR CLEANER

CIRCULATING
BLOWER

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

ON

OFF

OFF

OFF

OFF

ON

ON

ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

15 Sec.
Post
Purge

Fan on Delay
30 Seconds

0 2

17

22

52

0

60, 90, 120, 180 SEC.
Selectable Fan Off Delay

Summary of Contents for FG9-UP

Page 1: ...at have been wet or the furnace if deemed necessary FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury death or prop erty damage Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use an...

Page 2: ...4 Examine the furnace casing making sure the physical support is sound without sagging cracks or gaps Examine the furnace base making sure it is physically sound without cracks gaps or sagging and has a good seal 5 Examine the furnace casing for obvious signs of deterioration 6 Examine the burner flames to make sure they are in good adjust ment Refer to the pictorial sketch shown in Figure 2 as a ...

Page 3: ...ce any part of the control system and any gas control which has been under water Operating Instructions 1 STOP Read the safety information above 2 Set the thermostat to the lowest setting 3 Turn off all electric power to the appliance 4 Remove burner access panel 5 Move gas control switch to the OFF position Do not force 6 Wait five 5 minutes to clear out any gas If you then smell gas STOP Follow ...

Page 4: ...re you install the right size filter for your furnace Dirty filters greatly restrict the flow of air and may cause damage to the moving parts of the furnace If the filters become clogged the heat exchangers and blower motor could overheat resulting in a potentially dangerous situation Never operate your furnace without a suitable air filter Removing Filters Internally Mounted Air Filters Most upfl...

Page 5: ...on HEAT and the fan is set on AUTO and there is a call for heat a circuit is completed between terminals R and W of the thermostat When the proper amount of combustion air is being provided the pressure switch will close the ignition control pro vides a 17 second warm up period the gas valve then opens the gas starts to flow ignition occurs and the flame sensor begins its sensing function The blow...

Page 6: ...Remove burners from the burner assembly 7 Remove the upper cover plate at the top of the furnace Remove the internal baffle 8 The upper portion of the heat exchanger is now exposed 9 With a long flexible wire brush clean inside each tube at both the top and bottom The brush must pass around the rear heat exchanger tubes and then vacuum loose the scale and dirt from each tube 10 Clean vacuum all bu...

Page 7: ...s during the heating cycle This could be caused by low gas pres sure or faulty gas valve 9 FLASHES Indicates reversed line voltage polarity Both heating and cooling operations will be affected Check polarity at furnace and branch 11 FLASHES This fault will be indicated if the rollout jumper wire con nection soldered into the board is broken If this fault occurs the control will have to be replaced...

Page 8: ...PARTS LIST C G R W Y HUM EAC XFMR LINE CIR HUM EAC XFMR LINE PARK PARK HEAT COOL 17 18 23 24 30 25 31 32 33 48 20 21 22 26 44 27 28 29 34 36 37 47 52 63 50 51 49 56 59 62 58 60 43 45 38 1 4 2 6 10 11 13 7 8 9 12 3 5 14 16 15 O F F O N 9 6 13 9 24 46 27 40 42 35 29 8 61 53 19 ...

Page 9: ...CHANGER 32 PANEL FRONT Blower 33 PANEL FRONT Burner 34 PANEL TOP 35 SUPPORT BURNER 36 WRAPPER CABINET 37 PANEL VESTIBULE Lower 38 PLUG WINDOW CLEAR 875 MISCELLANEOUS 39 CLIP FILTER RETAINER 2Req d P3U G9T 40 COLLAR AIR INTAKE Burner Box 41 FILTER AIR FILTER SIZE Refer to Table 1 42 GASKET AIR INTAKE 43 GASKET COMBUSTION BLOWER 44 GASKET CONDENSATE PAN 45 GASKET BURN BOX TO VEST PANEL 46 GROMMET MA...

Page 10: ...On ALL P3U MODELS 2TH13700424 THERMOSTAT One stage heat Deluxe 24V with heat only sub base does not include fan switch NOTE For one stage cool or one stage heat cool must be used with sub base 2TB17700424 2TB17700424 SUBBASE 24V One stage heat cool Man ual changeover integral sub base System Switch Cool Off Heat Fan Switch Auto On 2ET07700224 THERMOSTAT One stage heat cool Programmable changeover ...

Page 11: ...035 19592 001 Rev C 0204 Unitary Products Group 11 SECTION IV WIRING DIAGRAM FIGURE 9 Wiring Diagram ...

Page 12: ...applies only to products installed in the United States and Canada EXCLUSIONS This warranty does not cover any 1 Shipping labor or material charges 2 Damages resulting from transportation installation or servicing 3 Damages resulting from accident abuse fire flood alteration or acts of God tampering altering defacing or removing the product serial number will serve to void this warranty 4 Damages ...

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