Crown Boiler Troubleshooting and Error Codes Guide
Page 53

B.Trouble shooting problems where a soft lockout code is displayed. When a soft lockout occurs, the boiler will shut down and the display will alternate between the number “9” and the letter “b” followed by a two digit service code. The boiler will automatically restart once the condition that caused the lockout is corrected.

Table 13.3: Soft Lockout Codes Displayed

CODE

CONDITION

POSSIBLE CAUSES

 

 

• Blockage in intake or vent system.

 

 

• Vent and/or intake system not constructed in accordance

 

 

with Part VI.

b 08

Pressure switch circuit open

• Blocked or leaking pressure switch tubing

 

 

• Heat exchanger or burner blockage

 

 

• Terminals exposed to high winds

 

 

• Blockage in condensate trap above vent.

 

 

 

 

 

• Heating load at time of error was far below the minimum

 

 

firing rate of the boiler

b 18

MCBA supply sensor detected temperatures in excess

• Defective primary pump or no flow in primary loop (Piping

of 200°F

Method 1)

 

 

 

• Control system miswired so that boiler operation is

 

 

permitted when no zones are calling

 

 

 

b 19

MCBA return sensor detected temperatures in excess of

• See possible causes for “b18”

200°F

• Flow through boiler reversed

 

 

 

• Sensor wiring reversed

 

 

 

 

 

• Flow through boiler reversed. Verify correct piping and

 

MCBA is reading a return sensor temperature higher

pump orientation.

 

• No boiler water flow. Verify that system is purged of air

b 24

than the supply sensor temperature. Condition must be

and that appropriate valves are open.

 

present for at least 75s for this error code to appear.

 

• Sensor wiring reversed.

 

 

 

 

• Supply or return sensor defective.

 

 

 

 

 

• See possible causes for “b18”

b 25

Supply water temperature has risen too quickly

• Inadequate boiler water flow. Verify that pump is

operating and that pump and piping are sized per Part

 

 

 

 

VIII of this manual

 

 

 

b 26

Boiler safety limit, or external limit wired across terminals

• See possible causes for “b18”

3&4, is open.

• Defective supply sensor.

 

 

 

 

 

 

• Inadequate boiler water flow. Verify that pump is

b 30

Temperature rise between supply and return is too high.

operating and that pump and piping are sized per Part

 

 

VIII of this manual

 

 

• Blockage in pressure switch hose

 

 

• Pressure switch wires shorted together

b 61

Pressure switch circuit closed with fan off

• Defective pressure switch

 

 

• Loose or miswired fan speed harness (if “b61” error code

 

 

is observed while fan is running)

 

 

 

b 65

Fan is not achieving set point speed

• Loose or incorrect fan speed control connection

• Defective fan

 

 

 

 

 

51

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Contents BWC Series Page VII II Specifications Product DescriptionIV Locating the Boiler III Before InstallingMinimum Clearance To Combustible Material Air for Ventilation Page Vent System Design VI VentingHorizontal Direct Venting Vent Options 1,2 2a Summary of Horizontal Venting Options 3c Positioning Vent Terminal Under Overhangs Vertical Direct Vent System Vent Options 6 2b Summary of Vertical Venting Options VENT/ AIR Intake Fitting Equivalent Length Removing an Existing Boiler From a Common Chimney Vent / Intake System Assembly7a STAR-34 Connection to Vent Collar Z-VENT III Connection to Vent Collar SAF-T Vent Ezseal Connection to Vent Collar 10 Fasnseal Connection to Vent Collar 11 Condensate Piping Arrangement Gas Connection To Boiler VII Gas PipingSystem Design General System Piping PrecautionsViii System Piping Method 1 Primary/Secondary Piping Boiler in Secondary Loop Piping Method #1 Heat Only 4a Piping Method #1 Secondary Loop Piping Shaded Pipe and Circulator Sizing for Boiler Loop Fitting Equivalent Lengths Method 2 Primary/Secondary Piping Boiler in Primary Loop Piping Method #2 Heat Only 10a Piping Method #2 Secondary Loop Piping Bolded Page Flow GPM Piping for Special Situations 14 Chiller Piping IX Wiring Wiring Connections Diagram Ladder Diagram Page Start-up and Checkout BWC Series Lighting and Operating Instructions For Your Safety Read Before LightingBWC Burner Typical CO2/O2 Combustion Readings Gas Valve DetailPage XI Operation Normal Display In Standby ModePage 170 First Digit Boiler Status Boiler StatusOutdoor Reset Curve Continuously XII. Service and MaintenancePage No Error Code Displayed XIII. TroubleshootingCode Condition Possible Causes Soft Lockout Codes DisplayedHard Lockout Codes Displayed XIV Parts BWC Replacement Parts List TBD Page Page Page Page Ignition Electrode Gasket, 5mm 240011 Page BWC Replacement Parts List Page Page Page Page Page PN 980040 BWC 08/05

BWC Series specifications

The Crown Boiler BWC Series is a modern choice for heating needs, renowned for its efficiency and robust design. This series offers a range of residential and light commercial heating applicabilities, ensuring both comfort and reliability for users.

One of the standout features of the BWC Series is its efficiency. Crown Boilers utilize advanced technologies to maximize energy output while minimizing fuel consumption. With an AFUE (Annual Fuel Utilization Efficiency) rating often exceeding 90%, users can expect significant cost savings on their energy bills over time.

The BWC Series employs a high-quality, stainless steel heat exchanger, which not only enhances performance but also extends the lifespan of the boiler. This heat exchanger is designed to transfer heat efficiently, ensuring that the maximum amount of energy from the fuel is converted into usable heat. Additionally, the design helps to prevent corrosion and maintain system integrity over years of usage.

For technological advancements, the BWC Series incorporates a modulating gas valve which allows for precise control over the boiler's operation. This feature enables the system to adjust its output based on the heating demands of the home, resulting in improved energy efficiency and consistent comfort levels. Moreover, this modulating technology reduces the frequency of cycling, thereby prolonging the lifespan of the unit and minimizing wear and tear.

Another characteristic of the Crown Boiler BWC Series is its user-friendly interface. The boiler is equipped with a simple control panel that allows for easy monitoring and adjustment of settings. This accessibility is essential for users who want to manage their heating system without the need for extensive technical knowledge.

In terms of installation and maintenance, the BWC Series is designed with convenience in mind. Its compact footprint allows it to fit comfortably in a variety of spaces, making it an ideal choice for homes with limited installation areas. Additionally, Crown Boiler's commitment to high manufacturing standards ensures that the units require minimal maintenance, providing peace of mind to homeowners.

Overall, the Crown Boiler BWC Series is an excellent solution for those seeking efficient, reliable heating. Its combination of advanced technology, quality construction, and user-friendly design makes it an attractive option for any residential or light commercial application. Whether replacing an old system or installing a new one, the BWC Series delivers comfort and performance that can be depended upon.
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