UB90 ignitor failures

Home Depot Employee

They are aware of this and are willing to help. I Forget his name but you must get through to someone in training & technical in Utica, NY.
You mention that the gas input rate is correct. When saying so, you are referring to negative manifold pressure right? Be prepared to discuss manifold (gas vave outlet), along with O2 and CO2 readings taken with your combustion analyzer. All three readings must be correct or adjusted. These settings are done with the little screws and can be touchy, so they don't share easily alot of info on doing. Once done, no more premature ignitor failures.

One more thing, I remember a high mount of ignitor failures on new boilers out of the box and set up correctly. Perhaps it was just do to asssembly or shipping because after replacing fist time all as fine.

Bob Sersen

UB90 ignitor failure

We are experiencing continuing occasional hot surface ignitor failures. Gas input rate is correct. They seem to overheat and lose continuity between electric lead and ignitor.Tested offset pressure. It doesn't read what it should and ECR hasn't provided the solution. Any ideas?

Mitch_4

which UB90?

the 50-100 has an induced draft and the 125-200 is forced draft, e latter using a negative pressure gas valve.

the 100 seies has a lowre manifold pressure (2.5ish, see the IOM) the 200 series is set up with a combustion analyser.9-10% co2.

improper set up causes rougher light offs causing premature ignitor failures.

The UB 95 is a spark ignition, not HSI

Home Depot Employee

correct

Brain Fart, UB95 is direct spark