Unsafe situations

[lame plumber]

if it wont turn off, then to my mind if it was to then run out of water due to a leak life would become interesting if it carried on running so unless you have proved the safety devices ie overheatstat,thermistors, gas failure on pcb etc all work its id in my small mind or at least ar, me i'd have turned it off and said leave alone till i have the parts.

 

[mfgs]

if it wont turn off, then to my mind if it was to then run out of water due to a leak life would become interesting if it carried on running so unless you have proved the safety devices ie overheatstat,thermistors, gas failure on pcb etc all work its id in my small mind or at least ar, me i'd have turned it off and said leave alone till i have the parts.

Yeah IF the safety devices don't work IF it was to run out of water. How is that an immediate danger? If a 2 port is stuck open and the boiler is constantly running, do you ID that aswell, just incase some parts of the boiler decide to fail?

 

[Ermintrude]

Yeah IF the safety devices don't work IF it was to run out of water. How is that an immediate danger? If a 2 port is stuck open and the boiler is constantly running, do you ID that aswell, just incase some parts of the boiler decide to fail?

No but the controller and logic controller for the two port don't send voltage to the gas valve. The pcb is a safety control, a defective control = ID

 

[Leo21]

Yeah IF the safety devices don't work IF it was to run out of water. How is that an immediate danger? If a 2 port is stuck open and the boiler is constantly running, do you ID that aswell, just incase some parts of the boiler decide to fail?

any ffd failure in any form is ID. Same as cooker lids not shutting of the gas when closed.

 

[PlumbersMate]

How do you test overheat stat? Just let it overheat?

 

[mfgs]

any ffd failure in any form is ID. Same as cooker lids not shutting of the gas when closed.

Yeah but that's not what we are discussing. The FFD could be perfectly fine, and there has been no mention of it being faulty. If all the safety devices test ok then it is not ID. There is no immediate danger. The PCB controls a lot of things, just because one part of it is failing it doesn't mean its all knackered. The correct classification would be AR.

 

[kris]

We can all say what if this what if that. Simple fact is if safety devices are workin and gas valve opening n closing when up to temp then its simply a broken down boiler un my eyes but lot of good comments on here. IF a safety device or something untoward was happening or failing due to this fault then its a different ball game. But if boiler functioning ok and thermostat is cutting in when up to temp then i cant see prob. I mean we can say what if a leak boiler on well itd the same if its switched on as long as overheat stat kicks in and works then fine.

 

[kris]

Good debate on this one guys ...

 

[dmheat]

I would test thermostat and ffd as well as other safety checks and if everything checked out then it can't possibly be immediately dangerous,how can you fail a boiler as ID for a faulty ffd when you've tested it and it's passed? A pcb is NOT a single component, 230v on a swl for ch demand does not = ignition! The ffd can, and will most likely, be 100% fine.

Even At Risk I think could be an excuse for not understanding the operation of the appliance adequately. Again 230v on a demand terminal doesn't mean the boiler is failing to utilise the low pressure sensor,flow switch,thermisters,overheat stat,flame rec,etc etc,all of which have to be satisfactory before ignition will commence in a modern combi . the likelihood is that the boiler is working fine,just stuck in CH,it's probably cycling fine off the boiler stat,probably modulating fan etc if it's got an air/gas ratio valve.

Ive had faulty selector switches on Baxis before,selecting hw only did nothing,with no programmer the boiler will fire constantly in ch and just cycle on/off its stat. So is that ID? Everything's working safely but there's a demand present where it shouldn't be?

 

[Ermintrude]

I would test thermostat and ffd as well as other safety checks and if everything checked out then it can't possibly be immediately dangerous,how can you fail a boiler as ID for a faulty ffd when you've tested it and it's passed? A pcb is NOT a single component, 230v on a swl for ch demand does not = ignition! The ffd can, and will most likely, be 100% fine.

Even At Risk I think could be an excuse for not understanding the operation of the appliance adequately. Again 230v on a demand terminal doesn't mean the boiler is failing to utilise the low pressure sensor,flow switch,thermisters,overheat stat,flame rec,etc etc,all of which have to be satisfactory before ignition will commence in a modern combi . the likelihood is that the boiler is working fine,just stuck in CH,it's probably cycling fine off the boiler stat,probably modulating fan etc if it's got an air/gas ratio valve.

Ive had faulty selector switches on Baxis before,selecting hw only did nothing,with no programmer the boiler will fire constantly in ch and just cycle on/off its stat. So is that ID? Everything's working safely but there's a demand present where it shouldn't be?

Yes ignition sequence is well documented, but let's say for fun the fan is picking up a stray volt or two and the fan pcb sending back correct value but flue overheat sat is not communicating with pcb and those stray fan vaults are causing a mess. ? So it lights and works ok.... So your actually doing all your 26(9) checks? I would just ID it.