I was at a call today, 2 story house with 2 units. Both ignitors bad and both had been replaced November last year.
Walk in house dwnstrs has mstr area filter and main hallway filter,both filthy dirty. Upstairs has 2 filters, filthy all black. Top it off h/o had other company install these 4 or 5 inch pleated filters in all return airs. And I found out the company only changes them 1 time per year. First thing I thought of is airflow restriction=problems. Upstrs. unit bad ignitor again and dwnstrs unit in safety lockout mode. Any thoughts? Lennox g4ouh60c for both floors. Live in Houston.