Norcold 442 Repair Manual page 20

B101
a 2-Way, skip to Step 13.
11. Check for 12 Volts at Points 1
and 2 of switch and ground as
shown in Figure 3.44 (AC-
ELEC STDBY-DC switch is
now set at DC.
12. There should be 12 Volts at
both Points 1 and 2. If not, and
connections are checked as
proper, replace
STDBY-DC switch.
13. Check for 12 volts at the DC
heater terminals as shown in
Figure 3.48.
14. If there is no 12 volt reading, a
bad connection is indicated
between the thermostat and
heater terminals.
15. If 12 volts is present, check the
DC heater for continuity as
shown in Figure 3.49.
16. Disconnect the DC heater
leads from the terminals.
17. Set the Volt-Ohm meter to the
Rx1 scale and measure the re-
sistance of the DC heater with
it at room temperature. The re-
sistance should be as indi-
cated below:
DC Element Resistance Reading
225 Watt .8 OHMs
150 Watt 1.2 OHMs
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.
18. If the heater does not measure
within ± 5% of the indicated
value, it must be replaced.
19. A shorted heater will cause the
DC fuse to blow.
AC-ELEC
Figure 3.48
Figure 3.49
3-20