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Phil, Mechanical Engineer.
Category: Plumbing
Satisfied Customers: 8687
Experience:  Retired mech. contractor, shop owner, 51 yrs experience.
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I have a aquastar model 125hx lp,a 1999.has trouble lighting

Customer Question

hi i have a aquastar model 125hx lp,a 1999.has trouble lighting ,im also on well water ,i cleaned the water screan ,i cleaned the generator so many times ,had to buy a new one ,it worked a few times now its still having trouble ,it lights once a day now ,please point me in a direction
JA: How long has this been going on? And how severe is the problem?
Customer: two months
JA: Do you plan on doing the work yourself?
Customer: yes ,so for
JA: Anything else we should know to help you best?
Customer: if i turn the temp adjust down all the way , sometimes that helps to light,
Submitted: 8 months ago.
Category: Plumbing
Expert:  Phil replied 8 months ago.

Hello, click here for the manual please

Turn on 3 hot taps and the shower set to hot all at once, tell me if you can get the water heater to fire.

(thats an indirect test for hard water scale build up in the heat exchanger)

We can go from there

Customer: replied 8 months ago.
Ive tryed that , sometimes it works sometimes it it doesnt ,
Customer: replied 8 months ago.
Lost my voice a couple of days ago , sorry
Expert:  Phil replied 8 months ago.

Thanks, ***** ***** case the thermostat most likely needs to be can get the exact same model from

Then you can install it wire for wire yourself... be sure to unplug or turn off the power to you furnace first.

Please rate my work, in exchange I will hold the question open for any follow up that you might require

Customer: replied 8 months ago.
What is the thermostate , is it the venturi, thats what my diagram has
Expert:  Phil replied 8 months ago.

So far it sounds like the heat exchanger needs to be cleaned with white vinegar, have you done that is a video on another brand but it shows you what is involved, click here.

Expert:  Phil replied 8 months ago.

I have a dentist appointment now, I will follow up with you in a few hours when I get back.