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Need wiring diag. for coleman 3500A816 heater

Wiring was all bad and had to re place sequencer 3115-3571

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co7196
  • 3433 Answers

SOURCE: Coleman Patio Heater wiring

This must be a top secret heater design. Coleman is dwfinately of no help. The whites go to the ignitors or the output of the spark generator. The black is generaly a ground. Good luck.

Posted on Jun 01, 2009

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I have a coleman evcon electric furnace. The blower fan runs constantly, the switch is in auto and the fans runs even when the thermostat is shut off.


Most likely on that particular electric furnace you have a fan sequencer that is closed (stuck shut). It is the black relay that you are looking at when you take off the furnace cover to access your heat strips. You should have a red wire coming from the blower motor that plugs into the side of it. If you have a ohm meter turn power off and remove wire. Check resistance across the sequencer and it should read OL. If you have resistance across it, the relay is bad. Replace it.

Nov 28, 2013 | Heaters

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Have Coleman mobile home unit electric furnace changed sequencer and limit switches strips stay on after cycle and also run with unit switched off


This is the one where you have to lay on your head to work on it, I assume? Has to either be a bad sequencer, or the thermostat/thermostat wiring. If all the strips stay on, something is miswired, or your thermostat is keeping them on.

Nov 05, 2013 | Heaters

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Have Coleman electric furnace and strips stay on no matter what you do changed sequencer and limits nothing left to change any ideas


Have you tried a new t-stat? They go bad. Also try jumping wires at t-stat, then disconnect & jump at furnace - to see if there's a short in the wire

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I have a coleman presidential electric heater in my mobile home. The heating element works but the blower wont turn on. What could it be?


First check your thermostat.. RED wire(power) should be connected to the GREEN wire(fan).... a Multi- Meter should read 24v if you have power. If there's power going to the FAN(Green) Then your looking at a Bad Blower Motor (AND, OR) A bad Capacitor.

Hopefuly it's just a loose wire or bad capacitor,, the motor isnt cheap..
!!!STAY SAFE!!!!!.. and best of luck to you.....

Nov 25, 2012 | Coleman Heaters

1 Answer

Working on a coleman 3ton split unit in a mobile home, when thermostat calls for heat, the heat strips come on and blower comes on. heat strips go off before the thermostat is satisfied and the blower...


Probably a bad limit switch on the strips or the heat sequencer/relay is falling out after continued amp draw. I would lean toward the heat relay/sequencer. Havent heard of any problems with coleman limit switches. These units were prone to get water inthe electrical compartments due to the evap coil being right above it. Check to see where the power break is starting at the strips and working backwards throught the circuit. That will tell you for sure. Make sure you have 24v going to the heat sequencer too.

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1 Answer

Is blowing cold air


This must be electric heat. Gas heat don't blow unless the burners are on first. You must have a broken heating coil. Can you be more specific?themobilian_312.jpgIf it's blowing cold air then a sequencer these limits or the coils are bad. Have you checked these things? If the coils and limits are fine then your sequencer is most likely it. themobilian_313.jpg

Nov 29, 2010 | Coleman Heaters

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