Heat issue continues

[Camping family]

Heat problem continues. Originally problem was heat would run 2-5 minutes. Replaced sail switch and fan cage fins were broken. Test ran 15 minutes n cuts off. Tech replaced thermostat and converter was making noise so replaced. Technician tested voltage problem now is have 13 + Volos at breaker box but not 12 volts at furnace. Losing voltage between panel and furnace. Any ideal technician is making calls. Problem now is factory rep are closed for next two weeks
Thank you

[flybouy]

Is the voltage drop apparent only when the furnace is running or is it low when at idle? If it's only low when running then I'd suspect the motor is failing. If it's low when not running then check for corroded wire connections, improper wire size, damaged wires, ibad fuse connection, or a poor ground connection.

[Camping family]

While still no heat. To date they have changed the thermostat, sail switch. High limit switch, converter, broken squirrel cage. They have ruled out clogged duck work. Furnace will run 10 minutes then cut off. Never reaches set temp just cuts off. Next they are going to change out the board. Guess we will see.

[Camping family]

Update on heat
While continued having heat issues. Tech changed out the board didn’t fix it. Tech removed furnace took to shop and completed bench test. This ruled out clogged duck work, bad ground on camper and anything else to do with the camper itself. Furnace continued with the problem. Contacted extended warranty company who sent out a 3rd party who agreed with the technician it is a bad furnace. They approved to replace the furnace. Hopefully Tuesday or Wednesday I will have heat.