I installed a Propex HS2000 about this time last year and it worked perfectly thru the winter all was good I was a happy camper. Tested it three weeks ago before heading into the mountains and it gets an error 5. Per manual that means the fresh air or exhaust tubes may be restricted, so I swabbed them both out and it all came back clean. I blew compressed air thru the tubes and tried the heater same issue. Dinked around with it for a while still gets the error. Sent it to Karl at Westy ventures and he ran it for a week with no problem, said it ran perfectly could be the thermostat, so he sent it back along with a new thermostat. I putt it all back in and I'm getting the same error
tomorrow ill pull the tubes out and run them strait with no bends in them see what happens.
Anyone have this issue? What fixed it?