New here, mr heater big maxx help needed

[cwilson66]

Hi there, just joined the forum, looks like some good info to be had here.

My problem is with my mr heater big maxx 50,000 btu.. its stuck in shutdown mode/no flame (2 blink code) as soon as i turn it on via thermostat or the wall switch i have it wired too, nothing runs inducer fan will not turn on, it will not go through its start up procedure. I replaced the board, same issue. Some help would be great as ontario canada is getting little chilly at night when i work out here.

Thanks
connor

 

[PoorUB]

My problem is with my mr heater big maxx 50,000 btu.. its stuck in shutdown mode/no flame (2 blink code) as soon as i turn it on

Check the wire going to the flame rod and make certain it isn't pinched or shorted out on the chassis of the heater.

That is my best guess. I might be totally off base!

 

[fitter30]

MUH 50 ?
24 vac board terminals 1 & 6 check power between them should be 0 vac. 24vac either hi limit or rollout switch tripped.
R to C 24 vac
C to W 24 vac call for heat
R to W 24 vac no call for heat

 

[TwoToque]

I usually only play with name brand commercial equipment (my disclaimer). Do you have power going to the combustion (Inducer) motor? If yes and it is not turning that would be an issue. If air flow is not proven nothing else should happen.

 

[cwilson66]

Thanks for the info guys. Did not have 24 at the gas valve... new board now i have 24v but the damn thing wont light... turn it on inducer fan runs, then electric igniter starts... gas valve clunks but wont light. Even installed a new valve and same thing board sends 24v to valve when igniter starts, but no propane through the valve what the heck? Its a new tank last year, regulator ext, i have propane on the inlet of the valve but nothing going through it, possible bad new valve out of the box?

 

[Mecnic]

Post in thread 'Mr Heater Big Maxx won't ignite' https://www.garagejournal.com/forum/threads/mr-heater-big-maxx-wont-ignite.469829/post-8851135

I had this same issue a couple of years ago.