Have a propane Pentair MiniMax Plus 400K btu heater,11 years old. I replaced the control module, both hi-limit safety switches, and pressure valve in the last six months. When turned on all the lights on the front panel are lit.All connections are clean and tight Inside, on the circuit board with three green lights, two of the three are lit. The pv one is not lit. A clicking sound is present when turned on and the lights blink. I am seeking answers on this one. Thanks.