I currently have a Peerless Pinnacle #PI-80REV1 boiler. After the boiler heats up to 104+ degrees, it shuts off and I receive and error code of F09. I have replaced the ignitor electrode and flame sensor as well as using the troubleshooting guide to check for additional problems. I can let the unit set for a day and push the reset button on the display module and the unit will run. When the temp returns to the 104+ degree, it will turn off.
Where is your installing contractor?