Heating Help

Baxi ht 380

Hi I am new here but have come often to learn. Having an issue maintaining a flame on baxi ht for dhw. With a tap open the unit struggles to reach 40c and the flame light flickers. Raised the output temp on a qaa73 remote but still same result. Am in hurricane sandy area trying to get people heat and need help thanks

Flickering Flame:

Did you check the gas pressure going to the valve, before and during the fire? And after? How much pressure drop?
Nat. Gas or LP?

baxi dhw issue

natural gas. have not checked pressure, would that be done with a combustion analyzer? i know the gas is the issue, as the unit fires and goes off constantly on a dhw call. although for about an hour yesterday it did fire and maintain fine, then back to the same issue. i appreciate your time and knowledge in helping me.

Baxi

We have problems with the Baxi 310 Fi combi's on a call for DHW.  There would be little or no flame and the diaphragm in the differential pressure assembly had a hole in it.

I don't know if the the ht 380 still uses a differential pressure assembly.  Check with their rep.: at Marathon - (800)461-4657