glow worm combi 100E-Low Gas Pressure-1 Bar

[ADONAI]

Weve had problem with lukewarm water ,also when the combi switches from CH(heating) To DHW (Water)there is no change in the flame size - I expected it to increase in size.
Engineer says the gas pressure reading was 1 Bar.He replaced the gas valve but still gets 1 Bar.

any ideas ?


Thanks.


Al.

 

[davebgas]

Gas pressure 1bar???!!!!!
the flames will be 100ft high.
Your pcb is probably gubbed not sending correct voltage to gas valve for hw.
You're better off getting someone competent in who knows

 

[ADONAI]

my mistake - i meant 1 mbar.

 

[onlyfitidealboilers]

what blr you got?

 

[ADONAI]

glow worm compact 100E .thanks.

 

[steve32]

what is the inlet pressure on gas valve or wp at gas meter i presume your rgi checked this before changing the gas valve.

 

[Gasguru]

It is normal for the HTG burner pressure to be the same as the DHW burner pressure on this model. The burner pressure on HTG can be adjusted down but most are left as the factory setting.

Providing the working pressure is ok at the gas valve then a common fault on these boilers is for the circuit board to ignite at the ignition pressure and remain at this level say around 5 or 6 mbar instead of ramping up to around 15mbar. The gas valves are normally ok.

Changing the pcb is not a plug and play job. The gas valve and pcb may require adjustment and setting up with a manometer.

 

[davebgas]

They do mate and come with a new thermistor that has the be put on. Get an engineer out. NOT a diy job

 

[ADONAI]

May sound stupid-but i cant understand the Pressure displayed on the main gas meter outside the property.it appears to have a circular dial with a scale between 0.5 and 1 (whatever that means-sorry) can someone explain how to read it?
the meter was installed in 1991.

 

[steve32]

you test gas pressure with a manometer this is not a diy job, your rgi should have tested it before he changed the gas valve.

 

[onlyfitidealboilers]

pcb all day long seen this loads of times on this blr.

 

[davebgas]

Get an engineer, it's a common problem if it's what I suspect and takes about 10mins to prove. Again not a diy job.

 

[ianmcd]

DO NOT attempt to repair any PCB on any gas boiler, there used to be some companies out there that claimed to be able to re-furbish PCBs probably still are, I have seen boiler electrics going on fire and boilers with burners staying on after the fan has stopped, if it is the PCB it must be replaced with Manufacturers new direct replacement, get an RGI in its not something you can do yourself

 

[gaswizzard]

.
the flame was about 1 cm and now it is up to 5cm .

Saves using a manometer I guess.

 

[ianmcd]

sorry Ronat but its nothiing to do with any experience you do or do not have it is against the law to carry out any AD Hoc repair to ANY gas appliance and the manufacturer would not approve anyone to repair a PCB the only Legal repair is to replace with a manufacturers approved part.