water-works.jpg

Worcester Bosch CDi Compact Boiler Error Codes

Including: Greenstar 25/30 Si Combi Greenstar 27/30 I system

Find Your Error Code

Code: T1


Cause: Ignition test – checking the igniter spark Difficulty: 1 2 3 4 5 Engineer: - Solutions To Try: Engineer Service Test Code.




Code: T2


Cause: Fan test – checking the basic fan Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer Service Test Code




Code: T3


Cause: Pump test – checking the basic pump Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer Service Test Code




Error Code: T4


Cause: Three way valve test Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer Service Test Code




Error Code: T6


Cause: Ionisation oscillator test Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer Service Test Code




Error Code: 9A 362


Cause: error – incorrect HCM fitted Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to inspect HCM and test. Replace if necessary.




Error Code: 9U 233


Cause: Heat Control Module (HCM) error – problem with code plug Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check code plug.




Error Code: B7 257


Cause: Internal error – possible control board problem Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check internal PCB. Replace if required.




Error Code: C6 215


Cause: Fan problem – fan running too fast Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Test fan and check board.




Error Code: C7 214


Cause: Fan problem – fan not running Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check leads and connections.




Error Code: D1 240


Cause: Return sensor error – sensor may be wet or damaged Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check sensor. Check for any damage.




Error Code: E2 222


Cause: Flow sensor short circuit error Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer will need to check flow sensor connection and leads.




Error Code: E5 218


Cause: Flow temperature too high Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Check temp sensors, check for blockage and possible air in the system. check pump performance.




Error Code: E9 219


Cause: Safety sensor fault – temperature too high, sensor short circuit or open circuit Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Check temp sensors, check for blockage and possible air in the system. check pump performance.




Error Code: EA 227


Cause: No flame detected or flame signal loss during operation Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Check gas inlet pressure. Check sensors and leads. Check gas control unit.




Error Code: F0 237


Cause: Internal error Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Site visit required from engineer.




Error Code: F7 228


Cause: Flame error – false flame or flame detected before burner started Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check flame detection sensor and leads. Check PCB.




Error Code: FA 306


Cause: False flame fault – flame detected after burner stop Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check flame detection sensor and leads. Check PCB.




Error Code: FD 231


Cause: Mains power fault – electrical power interruption Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check electricla supply to boiler and conenctions inside boiler.




Error Code: FA 364


Cause: Gas valve EV2 leak test failed – gas valve leak Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check gas valve. Replace if necessary.




Error Code: FB 365


Cause: Gas valve EV1 leak test failed Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check gas valve. Replace if necessary.




Error Code: A1 281


Cause: Pump stuck or running with air in the system Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer will need to check and test pump and vent system. Top up if required.




Error Code: C1 264


Cause: Airflow stopped during operation Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check flue inlet and interally inspect boiler.




Error Code: C4 273


Cause: Airflow present during last 24 hour Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Site visit required by engineer.




Error Code: D1 240


Cause: Return sensor short circuit Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check and test sensor.




Error Code: D4 271


Cause: Temperature difference between flow and safety sensor exceeds limit Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check safety sensors and check for blockages,




Error Code: E9 224


Cause: Max thermostat activated – flue gas thermostat overheat Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer will need to inspect boiler and flue.




Error Code: EF 349


Cause: Central heating boil detected – boiler operating at minimum burner load with temperature difference greater than 18°C between Flow & Return. Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Engineer to check pump operation and check temp sensors.




Error Code: NO CODE 212


Cause: Safety or flow temperature rising too fast Difficulty: 1 2 3 4 5 Engineer: Required Solutions To Try: Check pump operation, check heat exchanger, check blockages and check ensors.





Need an Engineer?

Plumber

Power Flush

From £250 + Vat

  • Removes Sludge

  • Improves Efficiency

  • Increases Boiler Life Span

Boiler Service

From £55 + Vat

  • Most Problems Fixed on Site

  • Gas, LPG and Electric

Emergency Call Out

No Call Out Charge!

  • 8.30am - 4.30pm

  • No Hidden Charges

  • Up To 20 Mile Radius

Need a Plumber?

Contact RP Plumbing & Heating today to book your engineer.

arrow&v

Registration No: 227159

RP Plumbing & Heating

About

FAQ

Portfolio

Location 

Contact

Get In Touch

47 Clifton Road

Poole

Dorset

BH14 9PW

07878 019 479

contact@rpplumbandheat.co.uk

Copyright 2020 RP Plumbing and Heating LTD Registered in England: 6428918 VAT: 925654995