I hate E133 code...

[obseen16]

Hi fellas, Got to go and look at a main combi with intermittant E133 fault, Last one i did was a baxi and they said it was a manufacturer fault and came out to sort it.... anyone had the Main combis doing this E133 fault? Apparently it runs for about an hour then the error code flashes up, im thinking faulty overheat stat may be the culprit on this one, just wondered if anyone else has come accross this fault on a Main combi?

Cheers guys

J

 

[Reg Man]

http://www.mainheating.co.uk/docs/main_combi_eco_elite_user_guide.pdf Check this out.

 

[Barry98]

Last one I Haida was a blocked trap

 

[arran197]

Check ignition and flame rectification probes, they could be bent. Check trap. Check gas valve is correctly adjusted. Check inlet working pressure.

 

[diamondgas]

As mentioned above .... If you want to speed up a test on the condensate then pour some water down the inner flue. I syphon a jug of water with a 'u'gauge tube, top of the boiler, one end in the jug, the other shoved into the access hole for the analyser You should be able to empty a ltr of water in there no problem

 

[Ermintrude]

As mentioned above .... If you want to speed up a test on the condensate then pour some water down the inner flue. I syphon a jug of water with a 'u'gauge tube, top of the boiler, one end in the jug, the other shoved into the access hole for the analyser You should be able to empty a ltr of water in there no problem

Sounds like probes getting too close? If it's intermittent and works a few times on reset its probes . Should get a £1 coin between them. Works when cold, heats up, modulates to off then it won't relight? - probes most likley, then check inlet pressure (if it's a main it's probably credit meter , had a few lock up) if then still no jot check syphon, unscrew base of conny trap and empty out ?

 

[obseen16]

Hi Fellas, went over there today to have a look, checked all the above mentioned, Probes - Perfect gap between them, cleaned them up with some wire wool (just incase). gas working pressure - perfect, combustion CO2% - 9% (Spot on) condensate trap - Clear, it syphoned 2 pints down the inner flue with no issues, checked thermistors and overheat stat they were fine. while i was there it locked out twice, first time was when i turned the boiler on from cold, and the second was about ten mins after that, it ignited everytime once the system was warm, im wondering if its ignition box or board, even the technical guys at main didnt know. chuffin thing.

 

[dancinplumba]

Gas valve

 

[arran197]

You're co2% should be 8.7 on high and 8.4 on low. So you're a bit over there.

I actually had a strange fault yesterday on a Duo Tec, could not find the fault. I hit the gas valve with a spanner during ignition and it came to life. Must have been sticking.

You can check the resistance of the solenoid to see if it's that. Top and bottom should be 7.4 k ohms. Was there a nice big blue spark from the electrodes? Did the gas pressure drop on the inlet whist going through ignition?