Chapter 5
Troubleshooting
5.1 No Heat
Familiarize yourself with the call for heat path as highlighted on the portion of the schematic, fig-
ure 5.3 on page 32, and the simplified flow chart shown in figure 5.1 on page 30. Figure 5.2 on page
31 has a troubleshooting flow chart which will enable you to quickly diagnose the problem and
take corrective action. Before you begin your diagnostics, ensure that the machine is programmed
for a temperature greater than room temperature (Microprocessor models) and is in good work-
ing order otherwise. For information on programming, see the programming manual which is
included with each machine or available on the B&C Technologies website. If there is sparking
from the ignitor but no ignition, check the incoming gas pressure and verify that the locally ob-
tained main gas regulator has sufficient BTU capacity to supply the machine (Maxitrol 325-5AL
for up to 300,000 BTU, 327-7L for up to 900,000 BTU). A chattering gas valve indicates improper
line pressure, not a faulty gas valve. The following troubleshooting guide assumes that there is no
sparking and no ignition fault lamp illumination.
5.2 Machine Will Not Start
Mechanical Timer Models
If the start button is pushed, but the machine won’t start, refer to figure 5.4 on page 32 and check
the following items:
1. Has cooldown time been added?
(a) The machine will not start unless cooldown time is added.
2. Is the Loading Door closed?
(a) Close the loading door.
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General