Scope
The troubleshooting table on the next two pages identifies the most common problems likely to be encountered with HC and HCS heaters. For additional information on how to service some of the components mentioned in the table see the following:

Tec-Note 6-04-133 Servicing...
Tec-Note 6-04-135 Controls...
Tec-Note 5-04-122 Setting Barksdale pressure switch...
Tec-Note 5-04-123 Use of pressure switches...

Intended users
This information is intended for use by qualified technicians. The troubleshooting information assumes that the troubleshooter is familiar with operation of the heater as described in other Heatec documents. Accordingly, this document does not provide detailed steps for operating the heater. Moreover, we assume that qualified technicians know how to use tools and test instruments that may be required to check and adjust the heater.

Make sure you know control functions
Before attempting to troubleshoot your heater you should fully understand the functions of its controls. Control functions are described in a separate Tec-Note.

Don’t overlook the simple things
The first thing to do when you find that an indicator light is not on when it should be on is to check its bulb. You would be amazed at how many service problems have been solved by replacing a burned-out bulb with a new one. Also make sure that electrical power is turned on to all heater components that should be working. We often overlook the simple, obvious causes of problems and look for more complex answers.

Pay special attention to the limit circuit
Most heater problems show up in the limit circuit. A problem in that circuit is indicated by one or more lights being off. So pay close attention to all the lights in the limit circuit. They are the ones with the clear lenses. They should all be on during normal operation.

Live circuits inside the control panel
Be aware that certain heater control panels have electrical circuits that are not shut off by the rotary door-mounted handle. Panels that combine Heatec heater controls and Astec plant controls may include live circuits controlled by circuit breakers elsewhere in the plant. Consequently, shutting off the main breaker inside the panel does not remove all power to components within the panel.

Technical Support
If you have a problem that you can’t resolve, call our service department (1-800-235-5200). Even if you are not able to solve the problem without our help, your efforts to do so before calling will pay off. You will gain familiarity with the product and be in a better position to describe the problem to our service personnel.