Furnace Troubleshooting and Instrumentation Class 8:00 am - 12:00 pm Heating Season is rapidly approaching and we at MCN Distributors, Inc. would like to invite you to a limited engagement Furnace Troubleshooting and Instrumentation Class. Hosted by John Doht, this informative class will help you learn the secrets of diagnosing a furnace, understanding correct instrumentation, and understanding common fault codes. We will also be showcasing recommended Testo tools with special promotional pricing available only at the class.