i have a modena 102 which when hot water is used the burner goes on and off repeatedly (it used to stay on continuously until tap is turned off). this makes a lot of noise and i would appreciate if anyone has any advice (i've tried adjusting the hot water temp, but to no effect). thanks
burner reignites
- Thread starter cj12
- Start date
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dont know these product's, but sounds like a faulty stat....
dont supose you get much call for heating in cuba chris........lol
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shh jas we might get some cheap cigars 
bout the same lengh of time i got sick of people asking was i really in iraq
i would be going with the dodgy gas valve
i would be going with the dodgy gas valve
I'm staying where I am I like the choccy biscuits.
On Off On during HW is often due to sludge in the primary side of the secondary heat exchanger, or limescale in secondary side. I expect (Don't know) that this ferroli has a double pass heat exchanger, not sure if that would make a difference, just a bit harder to clean.
Could be temp sensor(s) of course.
What's the period on and off?? Seconds??
How old? Hard water area?
On Off On during HW is often due to sludge in the primary side of the secondary heat exchanger, or limescale in secondary side. I expect (Don't know) that this ferroli has a double pass heat exchanger, not sure if that would make a difference, just a bit harder to clean.
Could be temp sensor(s) of course.
What's the period on and off?? Seconds??
How old? Hard water area?
you are correct chris it has
The Modena 102 does have a combined CH and DHW main heat exchanger (similar to Worcester 24i). Is that what you mean by double-pass? I think temp sensor failure leading to control by O/H stat is possibility.
I've got a copy of MIs here, but I think posters ought to get hold of their own copies. We do too much for them!
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Another thing, the Modena E has diagnostic lights!
cj12, does your Modena have a row of 5 small lights on the control panel, above the temp. control knobs? If so, which if any are on or flashing?
I've got a copy of MIs here, but I think posters ought to get hold of their own copies. We do too much for them!
+++++++++++++++++++++++++++++++++++++++++++++
Another thing, the Modena E has diagnostic lights!
cj12, does your Modena have a row of 5 small lights on the control panel, above the temp. control knobs? If so, which if any are on or flashing?
I went to a similar model a few weeks ago and the burner would not modulate down but just cut off.
Cycle time about 20-30 secs and water went cold for about 15 secs before it came on again.
Turned out to be the pcb at fault. Its very important to properly set up the gas rates on the pcb after setting the gas valve.
Tony Glazier
Cycle time about 20-30 secs and water went cold for about 15 secs before it came on again.
Turned out to be the pcb at fault. Its very important to properly set up the gas rates on the pcb after setting the gas valve.
Tony Glazier
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