ferroli domina 80e gas pressure problem

[BrianB]

downstream pressure is only reading 2.5mb?

when i try to increase it nothing happens, manometer doesnt budge

any ideas?

(the final 3 rows on the burner also arnt lighting but i assume thats down to the low pressure)

 

[Puddle]

Presume working pressure ?,were down stream?,how do you try to increase it ?

 

[BrianB]

At the downstream test point on the gas valve, It's like the valve is not fully opening, try'd a new valve too but having the same effect

 

[Billy Bob Bob]

what you getting from the meter to the inlet?

 

[gasmarc]

dodgy donkin on meter
isolation valve partially closed

 

[BrianB]

22mb at inlet, definitely no restriction there, the meter is only 2.5m away too

 

[SimonJohns]

Is this pressure when running on hot water at full flow?

 

[BrianB]

Pressure upstream doesn't change weather it's dhw or ch, always 2.5, inlet pressure is 22mb which drops to 21mb when running

 

[DJNelsonHeating]

The burner pressure on this boiler is SUPPOSED to be 2.5mb at minimum setting for Central Heating, so make sure the max call for heat is being applied!

[DLMURL]http://www.aroundtownflats.com/manuals/Boilers/Ferroli/FERROLI%20DOMINA%2080E%20GCNo.47-267-23.pdf[/DLMURL] (page 5 of the manual - "Gas pressure at main burner for central heating").

 

[DJNelsonHeating]

Just read your last post (I didn't refresh before you answered)....

It seems as if either:

Gas valve faulty and not opening beyond 2.5mb, but you changed that?
Call for heat not reaching Gas Valve correctly (PCB?)
Are potentiometers on dials broken, making it look like they are on max externally, yet internally, they are stuck on minimum physically?

From the manual:
"Boiler will not light for D.H.W.
If boiler works for C.H. but not for D.H.W. the fault is most likely to be the flow meter or D.H.W. sensor.
If the tap symbol light is on the fault is the D.H.W. sensor. If this light is not on then suspect the flow meter
has not operated."

 

[JayDee]

What Gas Valve is on these? Is it a Modureg, or a varient of? I don't know these boilers well

Have you tried going through the procedure for setting the High and Low pressure settings? Just to make sure you are adjusting the correct adjusting screws and following the procedure correctly.

Are all the connections to the solenoid clean and secure? Is there correct voltage to the solenoid? Sounds like theres only voltage for the first stage, low lighting solenoid, then no voltage to the high setting. Get your meter on it. See if you get call from PCB for high setting.

It'll be something really simple I bet..........Is the main solenoid shot? Have you got a mag tester?

 

[mpathe]

I'm having the same problem as mentioned in the thread with a customers boiler, I've checked the resistances on the gv coils and are ok, have checked the voltages going to the coils and got 74v on gv1 and 25v on the gv2. did you manage to fix this fault? can anyone give me some advice thanks

 

[Dotty]

thread moved.

 

[Rabbitman]

I've been getting quite a lot gas valves recently full of black dust,