Coleman 3400 812

[errol]

Furnace was working fine and it just quit overnite. Thermostat is working and fan works on manual.However the furnace will not come on?

Have replaced the fuses in furnace still no luck.

Furnace suddenly came on,ran ok and shutdown and once again refuses to come on.?

[Robert]

When it isn't working properly, do you here any clicking sounds and can you see or tell if any of the elements are energized/glowing ?


Sounds like a bad sequencer more than likely.

Thanks,
Robert

[errol]

No clicking noise.Furnace stayed off for 12 hours then came on again,lots of heat.It seems to just start when it wants to.

[Robert]

Hi,

Can't gaurantee without testing, but could be a bad sequencer.

Would have to know if sequencer is getting proper voltage to know.


On a call for heat, after 1.5 minutes max, you should have 24-28VAC across bottom terminals (front to back).


If so, you should have 120VAC from M1 to ground, M2 to ground, M3 and M4 to ground.


Should have 0VAC across M1/M2 and across M3/M4.



Sequencer # 3110-3571 @ $24.41 + $6.75 shipping.


If needed, it can be seen and ordered through PayPal from left side here:http://www.mobilehomerepair.com/ColemanElec.html


Or, by calling toll free after 9AM CST Mon thru Fri to

1-877-263-7860 and charging to Visa or Mastercard.



Thanks for inquiring,
Robert