Crown Boiler BWC Series XIII. Troubleshooting

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XIII. Troubleshooting

A. Troubleshooting problems where no error code is displayed:

CONDITION POSSIBLE CAUSES

Display Blank, Fan off, LWCO lights off • No 120VAC Power at boiler. Check breaker and wiring

between breaker panel and boiler

Display Panel Blank, Fan running

• Loose 120VAC connection wiring between boiler J-Box and

MCBA

• Blown “F1” fuse in MCBA (see Figure 13.2 for location).

Replace with 5A fuse provided

Display reads “U.125” continuously, Fan running

• Defective AT250 transformer

• Blown “F3” fuse in MCBA (see Figure 13.2 for location).

Replace with 4A slow-blow fuse provided

Boiler not responding to call for heat, Status code on display

=”0” (see Figure 11.1)

• Boiler is not seeing call for heat. Check thermostat or

zone wiring for loose connection, miswiring, or defective

thermostat/zone control.

Boiler ﬁres, but display panel is blank • Loose ribbon cable

• Defective display

WARNING

TURN OFF POWER TO BOILER BEFORE REPLACING FUSES OR WORKING ON WIRING.

Table 13.1: No Error Code Displayed

Figure 13.2: MBCA Fuse Location

Contents

Main BWC Series High Ef ciency Gas-Fired Hot Water Direct Vent Condensing Boilers INSTALLATION INSTRUCTIONS D E S I G N E D T O L Models: Page Page 2 I Product Description II Specications Figure 2.1: General Conguration Table 2.2: Specications III Before Installing IV Locating the Boiler 3 NOTICE 4 V Air for Ventilation Page 7 VI Venting A. Vent System Design Page Page Page Page TABLE 6.2b: SUMMARY OF VERTICAL VENTING OPTIONS TABLE 6.5: PERMISSIBLE VENT SYSTEMS AND PRINCIPLE VENT COMPONENTS TABLE 6.6: VENT/ AIR INTAKE FITTING EQUIVALENT LENGTH 14 B. Removing an Existing Boiler From a Common Chimney C. Vent / Intake System Assembly Page Page Page Page Page VII Gas Piping 21 VIII System Piping A. General System Piping Precautions B. System Design TABLE 8.1: FLOW REQUIREMENTS THROUGH BOILER 22 Method 1: Primary/Secondary Piping - Boiler in Secondary Loop Page Page 25 TABLE 8.5: PIPE AND CIRCULATOR SIZING FOR BOILER LOOP TABLE 8.6: PIPE AND CIRCULATOR SIZING FOR INDIRECT WATER HEATER LOOP Page 27 Method 2: Primary/Secondary Piping - Boiler in Primary Loop Method 3: Direct Connection to Heating System (Generally NOT Recommended) Page Page Page Flow (GPM) 32 D. Piping for Special Situations Page IX Wiring Page Page Page X Start-up and Checkout A. C. B. D. 1. 6. 2. 7. 3. 4. 8. 9. 5. 10. 11. 12. 1. 3. 2. 4. FOR YOUR SAFETY READ BEFORE LIGHTING BWC Series Lighting and Operating Instructions 39 OPERATING INSTRUCTIONS TO TURN OFF GAS TO THE APPLIANCE Page 41 Figure 10.2: Gas Valve Detail Table 10.3: Typical CO2/O2 Combustion Readings Page XI Operation Figure 11.1: Normal Display In Standby Mode 43 Page c 190 7. 0 1 FIGURE 11.2: BASIC MENU TREE d 144 1 = On 3 Reserved for Future Use 3.-22 INFORMATION MODEPARAMETER MODE 46 Table 11.3: Boiler Status Figure 11.4: Outdoor Reset Curve 47 XII. Service and Maintenance Page 50 XIII. Troubleshooting Figure 13.2: MBCA Fuse Location A. Troubleshooting problems where no error code is displayed: CONDITION POSSIBLE CAUSES WARNING TURN OFF POWER TO BOILER BEFORE REPLACING FUSES OR WORKING ON WIRING. Table 13.1: No Error Code Displayed 51 Table 13.3: Soft Lockout Codes Displayed 52 Table 13.4: Hard Lockout Codes Displayed