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21. In units with multiple frypots, add a bead of silicon along the joint between the frypots to ensure a
seal. Then, insert the top connecting strip.
22. Reverse Steps 1-25 to reassemble the fryer.
1.5 Troubleshooting and Problem Isolation
Because it is not feasible to include every issue that might occur, this section is intended to provide
technicians with a general knowledge of the broad problem categories associated with this equipment
and the probable causes of each. With this knowledge, the technician should be able to isolate and correct
any problem encountered.
1.5.1 Typical Problems
You are likely to encounter problems in these broad categories:
Read the following sections to learn more about each category. A series of troubleshooting guides is
also included at the end of the chapter to assist in identifying some of the more common problems. In
addition, Section 1.5.2 will guide technicians through interpretation of digital controller lights, helpful
in diagnosing problems.
Pilot Failure
There are two types of pilot failure: no pilot ame and unreliable pilot ame.
Ignition Failure
Ignition failure occurs when the gas valve no longer receives power, the gas supply stops, or the pilot
ame goes out. Solid-state controllers indicate ignition failure by illuminating the heat light and trouble
light simultaneously. Computers and digital timers will read HELP to indicate ignition failure. There
are three primary areas of focus in diagnosing and correcting ignition failure:
1. The gas and electrical power supplies
2. The electronic circuits
3. The gas valve.
1. Pilot Failure
2. Ignition Failure
3. Improper Burner Function
4. Improper Temperature Control
5. Gas Valve Malfunction
6. Computer Malfunction
7. Filtration Malfunction
8. Leakage
9. Basket Lift Malfunction
No pilot ame:
• Insufcient gas supply
• Clogged pilot orice
• Air in gas lines (usually in new installations).
Unreliable pilot ame:
• Open or grounded high limit
• Loose or corroded wire connections
• Low or no voltage out of thermopile
• Bad gas valve.