Boiler not firing after water main went off

[Stu666]

A couple of days ago we suffered a burst water main and have been without water until it was restored today via a temporary over land feed. However, the boiler will now not fire for either hot water/central heating, and the error code E119 is flashing. This seems to relate to a low pressure issue, but the pressure gauge on the boiler is well in the green on 1 bar. I've tried resetting and switching boiler off/on again, but nothing is shifting it. Any ideas please? The boiler is a Main Combi 30 Eco. Thanks in advance.

 

[Mopasgas]

try raising pressure to 1.5 or a little more, sometimes the sensor inside detecting the e119 fault is not reading thesame as the pressure guage .lower pressure ,if/ after it starts by bleeding out of rad ,call gas safe eng, to find fault

 

[Stu666]

Thanks Mopasgas, I raised the pressure and the problem immediately went away. Noticed the pressure gauge was reading lower AFTER I had increased pressure, so suspect the needle had been stuck on a higher reading. All working well now, much appreciated

 

[Mopasgas]

the maunal analoge pressure gauges must be made by Blind Naked Tebetian Monks with no fingers in a dark factory ,They are soooo far out of calibration it makes me cry sometimes.30 years of fixing boilers helps me get over it ! keep an eye on your Expansion Vessel Pressure as well ,( see loads of other posts on this ).
Glad to be of help

 

[AGAS]

Your gauge is blocked probably and needs replacing as problems will return