We are currently having issues with ionisation probes (supposedly) on a pair of large commercial boilers at a site. While discussing possible causes (not that we are too concerned as this issue has been dropped back in the lap of the manufacturers who commissioned them) I got to thinking of flame probe problems I had on another site many years ago.
The site had 3 floor standing gas boilers feeding a common header. When it came to commission them one boiler would happily cycle through and start up. The other two would cycle through then lock out. gas pressure okay, flame probes okay etc. While looking at the backs of the boilers and scratching my head I noticed that the electrical connection labels on the two faulty boilers were the opposite way round to the one on the working boiler (NEL, not LEN). Could it be something so simple as swapped mains connections? Changed over live and neutral on the two boilers and all working perfectly. Boilers commissioned and everybody happy.
I suppose the lesson learned from this is even when everybody does their job correctly you are still at the mercy of some numpty in the factory slapping the label on the wrong way!
The site had 3 floor standing gas boilers feeding a common header. When it came to commission them one boiler would happily cycle through and start up. The other two would cycle through then lock out. gas pressure okay, flame probes okay etc. While looking at the backs of the boilers and scratching my head I noticed that the electrical connection labels on the two faulty boilers were the opposite way round to the one on the working boiler (NEL, not LEN). Could it be something so simple as swapped mains connections? Changed over live and neutral on the two boilers and all working perfectly. Boilers commissioned and everybody happy.
I suppose the lesson learned from this is even when everybody does their job correctly you are still at the mercy of some numpty in the factory slapping the label on the wrong way!
