oil furnace problems

94cobra10

I have a Beckett oil furnace and its not working right. It doesn't kick on when it gets below the tempature I have it set at. I have replaced the thermostat, motor, fuel pump, and primary control unit. I'm not for sure what it could be. Could someone help me with this? There is times where it works just fine

Jamie Hall

Is this steam? Hot water? Air? It makes a difference on what it might be... and how to check it and fix it (and throwing parts at it probably isn't the answer).

94cobra10

It's a for heat in a mobile home. I replaced the motor and fuel.pump last year and the thermostat and primary control unit this month and I only replaced the primary control because I called a local oil heating company and they said it could be that and was going to charge me $45 an hour to trouble shoot it and I figured if I tried that and it fixed it I wouldnt have to pay for part and the hourly payment

Jamie Hall

Well, you sound like you want to trouble shoot it yourself -- so the first thing to do is to find out exactly what the controls on the unit are, and what controls what.

First thing I'd check is the thermostat wiring...

STEVEusaPA

In a total of one year you replaced the motor, fuel pump, thermostat, primary control, but didn't want to pay $45 for a professional diagnosis?

ww

cross the thermostat wires or the thermostat connections on the primary control.. and see what happens to get that out of the circuit. did you read the thermostat manual for proper settings..sometimes they have to be set with screws in and out,etc.

also make sure your wiring is all correct for the primary control and check all the wiring under the transformer too..check for loose connections leading to primary control as well.

it's all traceable using a voltmeter. what are the aquastat settings at now? sometimes you get a new part that isn't any good either.
what does your cad cell look like..is it clean...is there smoke in the flue pipe when burner is on..is the air on burner set?..is the nozzle correct..too big...causing more air...and not great combustion?..take one thing at a time...but crossing the thermostat connectors should tell you alot.

billtwocase

Sounds like you are spending money where you shouldn't be. I am thinking that you are having to reset this at times? $45 is a rather low price to pay to troubleshoot. Not sure if that would even be money well spent. We need more info and pics. Does it have a timer/relay board? Tank location?

Tony Massi

What type of thermostat did you replace and with what?
I have had experience with some of the new T87 thermostats working intermitted with carlin cad cell relays. If you have to hit the reset its something else. A lot of times with outside oil tanks the line freezes up outside or in the tank.

add

It is a motor home furnace,
Sometimes it works just fine.
replaced the primary control.
I bet the oil lines are gelling up at certain temperature............
I agree with Tony Massi.

94cobra10

I just replaced the cad cell and it works just fine now. There wasn't many more parts I could replace on it so I figured I would give it a shot and it worked. I replaced the motor and fuel pump last year because they were both bad.