No heat. The boiler is not operating. This boiler also provides hot water for the main house portable system. I found that the low pressure cut off has failed. The boiler is sitting at 20 psi G. The low-water pressure switch is set to cut out at 10 psi G. I bypassed the pressure switch and cycled the system with proper operation. The low-water pressure switch needs to be replaced. Peerless m#PI-T80. S#D26M07538 Part # minimum water pressure limit switch 91427. We will work up a price to replace the switch. Customer has coupon for free service call with $200.00 repair.