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I replaced an LED model control with an R7284U a year ago and it has worked fine until the last few days. Now when the call for heat is satisfied the burner shuts down normally, but display on control says hard lockout rather than standby like it should. Burner will not respond to a call for heat until it is reset. There are no operating conditions whichwould cause a lockout. Cad cell is running in low 200's, Fuel pressure is steady at 100 for the full run, and flame is stable.
When I simulate a high limit shut down and remove the call for heat the display goes to standby when the limit simulation is ended, and the burner starts with the next call for heat.
Only when the TT indicates the end of call for heat does the unit go into hard lockdown.