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if you have proper gas pressure to the unit check to see if voltage to ignitor or if glowing that is ok then check to see if voltage to both sides of the pressure switch if not check to see if pressure switch wires are tight then check to see if the copper tube going to it is plugged if not check the high limits to see if corroded if voltage to gas valve and it doesnt open bad gas valve
This means false flam sensed. As in the controller thinks there is a flame even though the gas valves are closed. I would suspect bad igniter/flame sense. If you have the manual, it tells you how to reset the fault history. That will clear the error message. Then try firing the heater again. Try this before repairing it to validate error message.
You didn't indicate what model heater you have, but here are some of the fault codes you might see. Could it have been GVO? You can download a manual for your exact model at www.raypak.com BD1 Board failure EEP Microprocessor error FAN Blower pressure failure FFL Flame sensing when pilot and gas valves are closed GVC Gas valve closed GVO Gas valve open HL1 High limit switch #1 open HL2 High limit switch #2 open IGN Ignition failure ILO Ignition lockout - Propane units only PRS Water pressure switch open ROL Heat roll-out safety switch open SNS Sensor failure, Water temp. below 36°F or above 110°F VNT Vent switch open