All the facts and questions around gas pipe sizing explained; 

New boiler, Property renovation, or adding appliances etc. Common problems and common misinformation.

To understand the need for correct gas pipe sizing it must be understood that burners in gas appliances ar...

Fault, Meaning, Official Cause, Our Comments 
 

F. 0 Flow–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective connection at electronics 

F. 1 Return–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defecti...

Fault, Meaning, Official Cause, Our Comments 

F.00 Flow–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective connection at electronics 

F.01 Return–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective...

Code, Meaning, Official Cause, Our Comments

F. 0 Flow–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective connection at electronics 

F. 1 Return–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective connec...

ROUGH DESIGN CRITERIA FOR HEAT LOSS CALCULATION

For more in debt analysis of U valves.

Best Overall Guide

http://www.microgenerationcertification.org/admin/documents/U-Values%20from%20Domestic%20Heating%20Design%20Guide%20v1.0.pdf

For walls; cavity, solid, insulated,...

LOCKOUT

If the fault is persistent or more severe the boiler will lockout with a error code. 

When the boiler 

has entered this error mode it will not attempt to restart until the "Reset" button is pressed.

ERROR CODES 

Display 

Description of fault 

Code Description Our comm...

Keston C36 Fault codes E01 to E99 common faults; E03 E06 E23 E24 E26 E35 E37

ERROR CODES 

E99 As E41 

E46 Flue sensor open circuit - check connections to flue sensor are in place 

E45 Flue sensor short circuit - check connections to flue sensor 

E44 Return sensor open circu...