Friend has a gas boiler with radiant heat and noticed today that it starts firing, shuts off, repeats, for about a minute or two before it quits.
The water heater has a flame and has maintained temperature (in the same room) and the temperature in the house has not dropped below the prescribed level from the programmable thermostat (there is water flow through the pipes that provide radiant heat, but there is a whiff of gas that can be smelled during the firing on/off.
I've read where this can be caused by low water flow through the system, or just a dirty burner.
Several service calls have been placed to local service businesses, but have not been responded to yet.
Is there anything to be reset or that can be manually cleaned?