Hello everybody. It's a 2 part question. The heater is a Raytherm H1-0330 First question: I turned off the heater with the toggle switch because of air in pipe noise, like dying elephants (not the issue). It wasn't heating at the moment. Done it before without any problem. This time when I turned it back on the electric came on but not the burners. Switched it off, then back on and nothing. However, if I push the red reset button it comes on fine, heats to thermostat temperature, kicks off, but won't come back on when room temp drops. If I push the red reset button, it heats again just, but repeats this situation. Question 2. The little red reset button is off to the side out of this picture. What's this silver metal button where the arrow is? I attached a picture...

I have a Navien CH240 Combi Boiler new in 2012. It is currently running on LP gas. I have over the years taken care of servicing it as far as cleaning filters and changing the flame rod assembly. I have even changed out the PCB board only to have the E012 error occur on a daily basis. I finally contacted a local service company who has been here 4 times and the error still comes on. Finally on the last visit they told me I needed a new air pressure sensor, gas pressure sensor and a new gas valve. I can get these items online and plan on doing it myself. My questions are- Will the new gas valve be set up for LP or will it need conversion? And will there need to be adjustments made to insure correct pressure to the boiler?