YFG255 SERIES GAS RETHERMALIZERS
CHAPTER 1: SERVICE PROCEDURES
1-18
1.7 Troubleshooting
Guides
The following troubleshooting guides are intended to assist service technicians in quickly isolating
the probable causes of equipment malfunctions by following a logical, step-by-step process.
1.7.1 General Troubleshooting
PROBLEM
PROBABLE CAUSES
CORRECTIVE ACTION
No display on
controller.
A.
Rethermalizer is not turned on.
A.
Press the ON/OFF switch to turn the
controller on.
B.
No power to rethermalizer.
B.
Verify that the rethermalizer is
plugged in and that the circuit breaker
is not tripped.
C.
Failed controller.
C.
If available, substitute a controller
known to be working for the suspect
controller. If the rethermalizer
functions correctly, order replacement
from FAS.
The controller is
illuminated, but there is
no output to gas valve.
A.
Float switch circuit is open.
A.
Ensure float switch circuit is fully
closed and is functioning. Make sure
float is moving freely up and down
and does not have a starch build up
and that the shaft is not bent. Replace
float switch if defective.
B.
Failed controller.
B.
Replace the controller.
C.
Temperature probe defective.
C.
Check temperature probe against
standard Minco probe resistance chart
on page 1-20. If found defective
replace temperature probe. .
D.
Gas valve is suspect.
D.
Go to "No burner flame" section.