Riello burner not coming on automatically when indirect hot water heater calls for heat

[Mr Blint]

Our 10+ year-old Buderus has a Riello burner that was replaced about 2 years ago. It has been working fine but I hadn't scheduled a flue clean-out in that time, or a nozzle replacement, so I signed up with a local long-established company to do it, different from the company who installed the replacement Riello because they had come unprepared to the last annual service, with a crappy $50 portable shop vac that blew soot all over the basement, not a real soot-vac, and when they replaced the Riello they changed me $2300 for the burner kit ($1000 on the internet) while keeping half the parts that came with it, and they charged me $1000 for labor for something that took them an hour.

The new company were here a couple of days ago. Now, when the indirect hot water heat calls for heat, the circulator comes on but the Riello doesn't. But if I push the button on the front of the Riello burner, it comes on instantly if the indirect is calling for heat. So I think the Honeywell controller is OK. Is there some wire inside the Riello that the tech might have forgotten to reconnect? The tech had never worked on a Riello and I had to tell him which screws to remove to access the nozzle assembly, calling on my hazy memory from watching it be done a few times over the years. So I'm thinking that he might have skipped some step.

 

[Fitter30]

That button is a reset. Assuming that it's a oil burner call your oil company see if they offer service or a recommendation. You want a service person that works on them if not daily at least twice a week. Ask if service person has a flue gas analyzer it is used for most efficient flame. If by resetting doesn't come on don't press the reset more than twice at one time. Oil sprays into the fire box unlike gas it only goes away by burning.