Service Letters

Below is a list of important documents regarding service letters for Johnstone products and resources. Find the service letter that meets your needs and click the connected link to download the PDF file. If you have any questions or need anything clarified do not hesitate to contact us.


Service Letters:

documents are current to displayed date:


Obsolete Heat Exchanger - DL Link

re: Clam Tube 80 Furnace

Ducted Systems Technical Services Letter  - DL Link

re: Incorrect Polarity Fault – RED Fault Code 9 Flash

re: LX Series Gas Residential Package Product Models: PCG, PHG.

HX Thermostats - DL Link

re: User Interface Update

Single Stage 33 Inch - DL Link

re: Blocked Drain Pressure Switch Fault

Expansion Valve Equalizing Tube - DL Link