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I know carrier products will run the fan for 90seconds after power up before doing anything if there's a call for heat when the power is turned on, or if there was a call for heat when power was shut off, but they give a code for that. If you let it run for a while and it doesn't initiate the heating sequence despite a call for heat (24v on 'W' terminal) then I'm inclined to say you've got a bad board.
If you have the receipt, take it back to the store with the receipt. They may give you an exchange. Otherwise, follow the directions in the fine print in the warranty statement in the back of the instruction manual or on a separate card included somewhere in the packaging material.
I would venture to say that if you hit the dash and the motor started running then the problem would be in the heater control assembly mounted in the dash, like bad wire to Heater switch connection. A bad connection can jenerate a lot of heat and start melting things unless you find the problem soon enough. The switch may already be damaged inspect switches and wireing for any vissible damage and replace as required. However if everything looks ok with the heater control assembly, Their are a few more things you can check to be sure of before relpacing the heater blower motor. Turn the heater controles to the high heat and fan on high as well, settings and remove the heater blower motor pig tail and check to see if power is getting to the motor,( use a 12 volt test light at the wire harness side of this connection ) also check for power going to and leaving the blower motor resistor assembly ( mounted to the side or top of the blower motor housing ). If so equipped. If you find no power getting to the motor at this point then you will half to start working your way back through the wireing towords the heater controles until you find the problem. Using your test light. Now if you did have power going to the motor then replace the motor. Good Luck From Ernie @ RedDeer, Alberta, Canada.
If the light and the fan are working then it is the heating element that has failed. You need to replace it.
Its not a difficult job but you have to take the back off the oven. The heating element is usually in a circular shape around the fan housing.
You have to disconnect the wires to the heater and remove the retaining screws, fit the new heater and reconnect. Remember to switch off the power before starting work
your blower motor is trying to seize up on you, it is time to change it, if the fan doesn't come on first your water heater should not light, the fan comes on first to get eccess gasses out of the burner compartment,, do not light with ot the fan first it could combust
There appears to be a short in the unit. Not sure where. The power to the fan is not interrupted completly when the fan shuts down, still feeding voltage to the fan, keeping it running slow. Before checking the wiring, please turn off power first.
possibly the thermal overload sensor failed internally? as indicated in the instructions there is a overload sensor and thay will typically fail in others appliances.
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