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dayton heater with honeywell smartvalve no heat
I have a Dayton model 4LX55 controlled by a Honeywell SV9540 smartvalve. This unit has previously worked for several years without issue. Last year it stopped producing heat but the blower would run and the pilot/flame would ignite. Following the troubleshooting instructions in the manual I replaced the HSI flame igniter (Honeywell Q3400A). It worked for a while and then started to act up again by running through the heat cycle, turning on burners, turn on blower and after a short time the burner would shut off and the blower keeps running. It then goes into a cycle mode and repeats the process every 5 minutes or so.
On the SV9540 I get a six blink LED fault code after the first cycle which indicates system lockout. Troubleshooting procedure calls for 1) low or no gas pressure, 2) HSI bad 3) flame sense rod contaminated or in wrong position 4) pilot burner in wrong position. I don't think item 1 is the problem so 2-4 could be the issue.
Is it possible that the HSI is bad again through improper handling and how do I check it for proper operation and orientation. Also any other troubleshooting tips appreciated.
Thanks in advance.
Oak Harbor, WA