I replaced the limit switch and set lower to 160 but still intermittently goes higher (220) with flame off
Finally got video and audio of the thing doing what it does
Not great, but you'll be able to hear (turn your sound up) and see temp
http://www.youtube.com/watch?v=l3adlVi9pP0
Lights top to bottom are
Flame
Pressure Switch
Limit
Circulator
Power
Temp gauge
12 o'clock is 160
1 o'clock is 190
2 o'clock is 220
3 o'clock is 250
At 1:20 flame starts and temp goes up
at 3:00 hits 160
at 3:30 starts making gurgling sounds near rear where relief valve and circulator are
at 3:45, 175-180 flame goes off - still gurgling
at 4:00 hissing sound is from the vent - pressure is 20
at 6:15 temp hits 220 even though circulator is still running
at 8:20 circ goes off , still 220
at 16:00 circ comes back on , now 225-230
at 17:00 temp starts back down
at 19:00 fan kicks on - temp is 160
Gas and flame and operates and turns off normally
Read more:
http://www.************.com/forum/b...il-mclain-gv-4-overheating.html#ixzz2qwDc0PGN