Norcold 442 Repair Manual page 17

B101
8. Check for 120 Volts at each
terminal to ground of the com-
bination control as illustrated
in Figures 3.37 and 3.38. Nor-
mal readings should show 120
Volts on both terminals.
9. If there is 0 Volts on both ter-
minals, check wiring connec-
tions. If there is 120 Volts on
only one terminal, replace the
Combination Control. If unit is
a 2-Way, skip to Step 12.
10. Check for 120 Volts at Point 1
and ground and Point 2 and
ground of switch as shown in
Figure 3.35 (AC-ELEC STDBY-
DC switch is now set at AC).
11. There should be 120 Volts at
both Points 1 and 2. If not, and
connections are checked as
proper, replace
STDBY-DC switch.
12. Check for 120 Volts AC at your
heater element connection as
shown in Figure 3.39.
13. If no voltage is present and the
preceding checks have been
made, then most likely there is
a loose wire connection be-
tween the combination control
and the heater element con-
nection at terminal block.
14. The last check to make is for
continuity on AC heater ele-
ment leads as shown in Fig-
ure 3.40.
15. With the Volt-Ohm meter set to
the Rx1 scale, check the resis-
tance of the heater (Figure
3.40 A). The resistance should
be as shown:
170W* 71 OHMS
300W 41 OHMS
200W 61 OHMS
These readings are acceptable +
or - 5%
Set volt-ohm meter to the Rx10
scale or higher and check the
heater element for a short to
ground. The meter should show no
movement.
* Early Version
Figure 3.37
AC-ELEC
Figure 3.38
Figure 3.39
Figure 3.40
Chassis
Ground
120 Volt Check of Combination Control Switch
Chassis
Ground
120 Volt Check of Combination Control Switch
120 Volt Check at Heater Connections
Heater Resistance Check
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