Lochinvar Copper-fin II/IIE 402 - 2072 - Manual (Page 33)

3
Troubleshooting
33
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Always
disconnect power to the appliance before
servicing. Failure to comply could result in
severe personal injury, death, or substantial
property damage.
Never jumper (bypass) any device except
for momentary testing as outlined in the
Troubleshooting chart. Severe personal
injury, death, or substantial property damage
can result.
Before troubleshooting:
1. Have the following items:
a. Voltmeter that can check 120 VAC, 24 VAC, and
12 VDC.
b. Continuity checker.
c. Contact thermometer.
2. Check for 120 VAC (minimum 102 VAC to maximum
132 VAC) to appliance.
3. Make sure thermostat is calling for heat and contacts
(including appropriate zone controls) are closed. Check for
24 VAC between thermostat wire nuts and ground.
4. Make sure all external limit controls are installed and
operating.
Check the following:
1. Wire connectors to control module are securely plugged in
at the module and originating control.
2. Gas pressures:
Refer to the Gas Connections Section of the Installation and
Operation Manual for detailed information concerning the
gas supply.
Check control module fuses
ALWAYS check control module fuses before
replacing control module or any major
components (blower, etc.). If one of these
fuses is blown, it can prevent the control
module or other components from operating.
1. Turn OFF the power to the appliance at the external line
switch.
2. Remove front access cover.
3. Inspect fuses F2, F4, F5, and F6, see FIG. 3-1 below.
F6
5 AMPS
F5
5 AMPS
F4
5 AMPS
F2
3.15 AMPS
4. The appliance is shipped with four (4) spare fuses in a plastic
bag attached to the control panel.
5. If necessary, replace open fuse (F2 is 3.15 amps and F4, F5,
and F6 are 5 amps).
Note: Fuses F2 - F6 are all slow blow fuses.
Do not jumper fuse or replace with any fuse
except as specified. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
6. Install front access cover after fuse inspection.
7. Restore power to the appliance at the external line switch
and verify boiler/water heater operation (Start-up Section
in the Installation and Operation Manual) after completing
boiler/water heater service.
ƽ WARNING
ƽ WARNING
NOTICE
ƽ WARNING
Figure 3-1_Control Module Fuses
Copper-fin II/IIE Boiler and Water Heater Service Manual