Tjernlund SS1C SideShot with UC1 Universal Control (Version X.04) 8504103 Rev C 02/04 - Manual (Page 21)

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CHECKING MEMORY FOR LAST FAULT CODE
IMPORTANT: Prior to accessing the fault code memory, note the settings of the dip switches so that they can be returned to their
original Pre / Post-Purge positions. When power is supplied to the UC1 use caution when moving dip switches.
The last fault code can be retrieved at any time by setting all dip switches 1-8 to the up, or “on” position. The last fault code, or
lack there of, will be indicated by counting the number of times LED 4 flashes. By moving any of the dip switches back to their
original position, the fault code will be cleared. NOTE: The UC1 board must have its 115 VAC power supply present when any of
the (1-8) dip switches are moved back to their original position for the fault code to clear.
SYMPTOM 1: SS1C OPERATES CONTINUOUSLY
Verify that Venter is not in post-purge mode which could last up to 16 minutes. A factory post-purge has been set for 2 minutes.
LED #4 & #5 (Red) will flash in unison during post-purge. A Venter pre-purge could also be set for up to 35 seconds. LED #4 &
#5 (Red) will flash alternately during pre-purge. See “Pre / Post-Purge Settings” on page 5.
Verify that LED #1 (Amber) is not lit.
Yes, LED #1 (Amber) is lit: Check interlock wiring. Confirm burner control(s) are functioning properly. UC1 control is receiving
constant call for heat signal.
LED #1 (Amber) is not lit: Replace UC1 circuit board part number 950-8804.
SYMPTOM 2: SS1C MOTOR DOES NOT OPERATE
Verify that UC1 control has power, LED #5 (Red) should be lit. Verify that LED #4 (Red) is not flashing. See “LED Status & Fault
Indicators”, page 19. Verify RED voltage selection jumper corresponds with interlock voltage (i.e 24V, 115V or “Dry”).
No: Check circuit breaker, disconnect switches and wiring. Confirm that Venter leads are connected to N & MTR terminals.
Yes, LED #5 (Red) is lit: Verify that the interlocked burner is calling for heat, LED #1 (Amber) should be lit.
No, LED #1 (Amber) is not lit: Verify interlock wiring and that thermostat/aquastat is adjusted to call for heat. Verify that the RED
voltage selection jumper is installed so that it matches the voltage of the interlocked burner.
Yes, LED #1 (Amber) is lit: Verify Prover safety circuit fault does not exist. See, “LED Status & Fault Indicators”, page 19.
If faults exist check Prover P1 & P2 safety circuit.
If no faults exist, check for 115 VAC across terminals N and MTR.
Voltage present: Confirm motor leads are securely on N and MTR. If so, replace SS1C motor part number 950-0625.
No voltage present: Replace UC1 circuit board part number 950-8804
SYMPTOM 3: SS1C OPERATES, BUT BURNER DOES NOT
Push reset button on SS1C high limit inside electrical box. NOTE: Insufficient post-purge may cause limit to trip. If the limit switch
trips, verify that the post-purge setting is long enough to remove residual heat from the combustion chamber. If high limit will not
reset and has an open circuit, replace high limit part number 950-0740. If high limit trips repeatedly, do not operate the heater until
the source of excessive heat has been determined and repaired. For any newly established call for heat the SS1C will run for 60
seconds to try to close the fan prover circuit (P1 to P2). If circuit can not be made after 60 seconds LED #4 (Red) will flash 3
times, indicating a prover check circuit fault on UC1 start up. NOTE: The UC1 safety circuit and LED #4 will be reset if the call for
heat interlock signal or 120 VAC power is removed. If the fan prover makes on start up, but breaks for more than 10 seconds dur-
ing the burner cycle, LED #4 will flash continuously indicating a prover circuit fault. The SS1C will continue to run for 10 minutes to
try to make the prover circuit as long as a call for heat exists. If Prover is not made within 10 minutes, the SS1C will shut down
and LED #4 will flash 4 times indicating a prover circuit fault. Remove the call for heat and then reestablish to reset the UC1
prover safety circuit (P1 to P2) & LED #4.
Verify that LED #2 (Green) is lit.
Yes, LED #2 (Green) is lit: Verify that "call jumper" is connected from J1 to J2 on UC1 circuit board if using typical wiring where
supply voltage from terminal 1 is routed to terminal 3 through “call jumper” then to 4 when appliance interlock relay makes. With
call for heat established, verify that wiring is correct by measuring voltage between terminals 1 & 2 and 2 & 4 of UC1 terminal strip.
Voltage should be the same in both cases, if not rewire per appropriate diagram or confirm burner control(s) are functioning prop-
erly. NOTE: If a different voltage source is provided to terminal 3 which is switched to terminal 4 or when using the A-B dry con-
tacts, voltage measurements may not apply.
No, LED #2 (Green) is not lit: Remove power from UC1 and verify dip switch #9 is up or “on” to deactivate Fan Prover status
check. Remove P1 and P2 prover leads off of Fan Prover switch and jumper together. Reset SS1C High Limit if not previously
done. Reestablish power and call for heat. After Venter pre-purge, if set (up to 35 seconds), LED #2 (Green) should light.
No, LED #2 (Green) does not light: Replace UC1 circuit board, part number 950-8804.
Yes, LED #2 (Green) lights up: The Fan Proving switch may not be closing, SS1C High Limit may be tripped, wiring connections
are incorrect/broken or burner control(s) are not functioning properly. Push reset button on SS1C high limit inside electrical box.