Lochinvar 1 service manual Before troubleshooting, Check the following, Check control module fuses

3 Troubleshooting (continued)

WARNING	Label all wires prior to disconnection when
	servicing controls. Wiring errors can
	cause improper and dangerous operation.
	Always disconnect power to the boiler
	before servicing. Failure to comply could
	result in severe personal injury, death, or
	substantial property damage.

WARNING 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 boiler.

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 control module and originating control.

2.Gas pressures:

•Maximum: 14 inches w.c. (3.5 kPa) natural, 14 inches w.c. (3.2 kPa) LP with no flow (lockup) or with boiler on

•Minimum: 4 inches (5 inches on 1.0 models only) w.c. (1.0 kPa) natural, 8 inches w.c. (2.0 kPa) LP with gas flowing (verify during boiler startup)

Service Manual

Check control module fuses

NOTICE	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 boiler at the external line switch.

2.Remove the front access cover.

3.Remove the two (2) screws securing the control panel to the unit to gain access to the control module.

4.Inspect fuses F2, F3, F4, and F5, see FIG 3-1 below.

Figure 3-1Control Module Fuses

F3 - 1.25 AMP FUSE

MAIN BOARD

F4 - 3.15 AMP FUSE

BLOWER

F5 - 5 AMP FUSE

PUMPS

F2 - 3.15 AMP FUSE

24V SUPPLY

5.The boiler is shipped with six (6) spare fuses in a plastic bag located under the low water cutoff on the control module.

6.If necessary, replace open fuse (F3 is 1.25 amps, F2 and F4 are 3.15 amps, and F5 is 5 amps).

Note: Fuses F2 - F5 are all slow blow fuses.

WARNING 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.

7. Re-install the control panel using the two (2) screws removed in Step 3. Re-install the front access cover after fuse inspection.

8. Restore power to the boiler at the external line switch and verify boiler operation (Section 9 - Start-up in the SYNC Boiler Installation and Operation Manual) after

completing boiler service.

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