I have a 9 year old Pentair Mastertemp 400HD. It has been very reliable, with the exception of a past thermister replacement and this past spring I had to replace the manifold due to a crack. It has been running since the manifold for two months no issues. Now, when I call for heat from my Hayward control panel, the Pentair gets power, LED display shows firmware, etc and the Pool On light turns on. Typically this is when it would fire, but I get no sounds, spark attempts or anything. Just the LED lit up with temp and Pool On. Any tips on what to look for in it's safety protocol? Is there a blinking light behind the control panel that will give me a code, or what are my initial troubleshooting steps. Thanks!