I have a Pentair Master Temp 400 along with a Intelliflow, Intellitouch, Intellichlor (which is also giving me fits). I've had it all for about a year and haven't had any problems with the heater, but the last time I went to fire it up it would not respond.

Neither the "spa on" or the "pool on" button will respond. If I shut the power off at the breaker and then turn it back on I get this on the display:

All LEDS go on momentarily and the the display just shows "128" and then "r=5" and then goes blank. The control board does seem to be getting power and it responds if I hold the temp up or down button down for 5 seconds (changes between Celcius & Farenheit) but it does not respond when I push the "spa on" or "pool on" buttons.

Is the r=5 an error code? I don't see any reference to it in the manual?

Thanks!

Sam