Saunier duval isofast f28e

[matthew clack]

hi all please can some one help me i have a saunier duval isofast f28e and am geting the error 05 ff. i have checked the overheat state in the top of the boiler and reset it but now the boiler will only fire up for about 5 sec then just go to 05 ff but the overheat state dos not tripout again. This is doing the same if i have the water or heating on thanks matt[h=1][/h][h=1][/h][h=1][/h]

 

[SimonJohns]

Have you got pressure in your boiler?

 

[matthew clack]

ye have that up to 1.5

 

[matthew clack]

hi can any one help me with this please

 

[sheff paul]

hi all please can some one help me i have a saunier duval isofast f28e and am geting the error 05 ff. i have checked the overheat state in the top of the boiler and reset it but now the boiler will only fire up for about 5 sec then just go to 05 ff but the overheat state dos not tripout again. This is doing the same if i have the water or heating on thanks matt[/QUOTE

sounds like thermistor problem

 

[matthew clack]

hi thanks for your reply paul is there any way to test it thanks

 

[sheff paul]

hi thanks for your reply paul is there any way to test it thanks[/QUOTE

test for resistance with a multimeter

 

[matthew clack]

ok thanks paul i have 0.2 to 0.3 on the multimeter

 

[sheff paul]

ok thanks paul i have 0.2 to 0.3 on the multimeter

contact saunier duvall technical,they should tell you the right resistance reading,print out the fault finding flow chart,that should help you

 

[matthew clack]

hi were do i get the print out the fault finding flow chart thanks

 

[matthew clack]

hi have contacted saunier duvall and they will not tell me the right resistance reading dose any one know what it shoud be or is there a way to buypass it to test i have bypassed with a bit of wire but this just dose not do any think as i think its goto have the right resistance thanks

 

[matthew clack]

can any body help with this thanks