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LOCK-UP – Radio Frequency Interference
When all regular troubleshooting items have been addressed about possible lock-up problems, look at this
possible problem.
There have been some chips manufactured about mid 1995 that may lock up, often very shortly after a
spark starts. This is often an intermittent problem and if the unit is equipped with a DJM2 it may also lock up
without any lights "on". (However, in some cases, some lights may be "on"). If you witness this problem you will
note that just after the combustion fan goes to light off speed the lockup will occur within a fraction of a
second of the spark ignition beginning. Usually a pilot does not get time to light. The unit will reset if power
is turned off for 30 seconds and then restored.
The spark creates radio frequency noise or radio frequency from some other source interferes with the
electronics. This problem can also occur on units that have no spark but some other radio frequency source
is nearby.
Installation of a radio frequency filter will resolve the problem. Disconnect the wires from "H" and "N" on the
C-TRAC2. Connect them to the RFI filter. Connect the outlet of the filter to the "H" and "N" terminals with
wires no longer then six inches in length if possible. Ensure the RFI filter is well grounded.
A filter that will resolve this problem is available at most electronics wholesalers. One we have used
successfully is the CORCOM model 1VK1 EMI filter:
L-2X1.86 MH
C-2X.1UHF (x2) SH
2X.0055UF (Y)
R-1.5 megohms
IOM-12
C-TRAC2.1 MANUAL
Page 18
March 1999 R1
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