Can someone please give me some info? We had a new Lennox EL296UHE gas converted to propane, forced hot air furnace installed in 9/2018. 1/25/21 it failed to ignite and there was an E200 Hard Lockout error msg. We have had many hvac contractors over to diagnose and it was determined the Flame Rollout switch on the right side was tripping any time it tried to ignite. Upon investigation there is a tarry soot/sludge throughout our system in the condensation lines and exhaust. It was discovered the propane regulator was supplying wat below minimum pressure. My question is, during the gas to propane conversion was there a setting for a low pressure lockout that was supposed to be adjusted for propane setup? The propane company washed their hands of any involvement and the hvac company says it just happens and it's not covered under warranty. Has anyone ever seen or experienced this? 2.5 yrs old and secondary heat exchanger is clogged and needs to be replaced? Help????
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