Evaluating The Results; Troubleshooting Suggestions - Wells WB-2 Supplemental Service Instructions

OPERATIONAL CHECKS (continued)
CAUTION:
ELECTRIC SHOCK
HAZARD
Live electric circuits may
be exposed during these
procedures. Take necessary
precautions to avoid electric
shock.
CAUTION:
BURN HAZARD
HOT SURFACES
Equipment surfaces may be hot
during these procedures. Take
necessary precautions to
avoid burns.
E. EVALUATING THE RESULTS
1. Presence of 120V in Test #1 or Test #2 (calling for heat but
element not heating) indicates a damaged heating element.
2. Absence of 120V in Test #1 or Test #2 when calling for heat
indicates:
a.) power switch
OFF
b.) temperature control is set too low; or,
c.) damaged temperature controller; or,
d.) a wiring or connector problem
3. Open or shorted temperature sensor in Test #3 indicates:
a.) damaged temperature sensor
b.) a wiring or connector problem
F. TROUBLESHOOTING SUGGESTIONS
1. In 208/240V units, the elements are wired in series: in 120V units,
the elements are wired in parallel.
Amperage readings 1/2 of normal indicate a 208/240V unit
operating on 120V, or possible electrical problems in either the top
or bottom grid assembly. Wiring investigation, as well as voltage
and resistance measurements, may be required to isolate the
exact problem.
2. Amperage readings significantly above normal indicate either a unit
operating on the wrong voltage, a partial short, or a deteriorated
heating element. Again, voltage and resistance measurements will
be required to pinpoint the problem.
3. Failure of an individual grid assembly to heat indicates electrical
or component problems in that area. Voltage measurements will
be required to isolate the exact problem.
4. Grids which heat, but do not come up to temperature, indicate a
possible temperature adjustment problem, a damaged element or
a problem with the controller or sensor. Also note that heavily
carboned grids will exhibit this symptom.
5. Grids which overheat uncontrollably indicate either a temperature
sensor that is not firmly attached to the lower grid, a damaged
temperature controller or (rarely) an electrical short.
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or damaged; or,