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Old 01-07-2013, 01:08 AM   #31
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Furnace clicking noise, blower runs continuously


I've missed why you think you also have a limit control problem?

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Old 01-07-2013, 01:20 AM   #32
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Furnace clicking noise, blower runs continuously


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I've missed why you think you also have a limit control problem?
Beenthere posted earlier and said that could be the cause of the clicking noise I was getting and the furnace not cycling as its suppose to.
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Old 01-07-2013, 01:22 AM   #33
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Furnace clicking noise, blower runs continuously


I'm not crazy about the new furnaces out there so I tend to nurse the older ones along in the mild climate I live in but...
You have a whole lot of potential repair expenses coming up/ many of them are ones that not too many tech are skilled in any more!
Your problems right now may be from a cracked exchanger which I think is the more immediate issue to check into as it is a serious health issue and not repairable. I'd get someone in to at least do a thorough inspection of the exchanger before going any further.
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Old 01-07-2013, 01:36 AM   #34
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Furnace clicking noise, blower runs continuously


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I'm not crazy about the new furnaces out there so I tend to nurse the older ones along in the mild climate I live in but...
You have a whole lot of potential repair expenses coming up/ many of them are ones that not too many tech are skilled in any more!
Your problems right now may be from a cracked exchanger which I think is the more immediate issue to check into as it is a serious health issue and not repairable. I'd get someone in to at least do a thorough inspection of the exchanger before going any further.
You are correct about the heat exchanger possibly having issues since its such an old furnace. I had a look up into the exchanger where the burners are and they look very clean with no corrosion. I also checked the flames when the blower turns on to see if there was a change in the flame colour and if it was jumping around but I saw none. That leaves me to believe that the exchanger is ok for now. I guess to be absolutely sure I would have to get a pro to really do a thorough check of the unit which hasn't been serviced by a pro in years.

I noticed you are from Vancouver, that is where I am also. Doesn't really get that cold in our city but the rain sure puts a damper on everything.
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Old 01-07-2013, 10:02 AM   #35
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Furnace clicking noise, blower runs continuously


Yeah, a working furnace like yours would either be from lower mainland or southern California. Further away from the moderating temp of the sea (beyond Surrey) means we don't see them anymore.
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Old 01-07-2013, 10:34 PM   #36
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Furnace clicking noise, blower runs continuously


Ok, so i replaced the fan off temp switch with a CAM-STAT combination fan and limit switch. Wasn't cheap, was over $100, was the only one that matched the old one. No more clicking noise but now the burners would stay on even after the blowers shut off. The blowers stay off for a couple minutes and come on again while the burners stay lit. I have a separate fixed limit switch that controls the burners. The burners were shutting off fine before I changed the fan off temp switch. What do you think is going on? The thermostat was at 70 and burners wouldn't shut off. I turned the thermostat down to 65 and the burners shut off then the blower ran for a min or so and shut off which is the normal operation. Thermostat faulty? I bought a new digital thermostat but haven't installed it yet.

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Old 01-07-2013, 11:27 PM   #37
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Furnace clicking noise, blower runs continuously


oh man..... going for a glass of wine..... see you in the morning...lol
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Old 01-08-2013, 04:21 AM   #38
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Furnace clicking noise, blower runs continuously


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Ok, so i replaced the fan off temp switch with a CAM-STAT combination fan and limit switch. Wasn't cheap, was over $100, was the only one that matched the old one. No more clicking noise but now the burners would stay on even after the blowers shut off. The blowers stay off for a couple minutes and come on again while the burners stay lit. I have a separate fixed limit switch that controls the burners. The burners were shutting off fine before I changed the fan off temp switch. What do you think is going on? The thermostat was at 70 and burners wouldn't shut off. I turned the thermostat down to 65 and the burners shut off then the blower ran for a min or so and shut off which is the normal operation. Thermostat faulty? I bought a new digital thermostat but haven't installed it yet.
The blower cycling on and off is from the fan switch sensing the air becoming to cool.

The burner staying on may be just from inaccuracy in the thermostat.
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Old 01-08-2013, 04:40 AM   #39
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Furnace clicking noise, blower runs continuously


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The blower cycling on and off is from the fan switch sensing the air becoming to cool.

The burner staying on may be just from inaccuracy in the thermostat.

The blower seems to be running fine. I put a longer ground wire on the motor and grounded to the blower housing. I think its about time to change out the thermostat. I already bought one as I've mentioned above. The clicking I was getting was the Fan control switch. I was hearing it clicking rapidly last night, when it stopped I banged on the switch and it started clicking every time I hit it. The new switch I replaced it with is a universal fan and limit combo switch but I only wired the fan control part of it since I have a fixed limit switch already on the furnace.

This is just happening, noticed my blower is not coming on for some reason now. I can hear the burners light and stay on for a min or so and shut off which tells me the limit switch is doing it's job but the blower doesn't start up. Wiring issue here?

Nevermind, lol, I forgot to turn the shut off switch at the furnace back on after installing the limit switch.

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Old 01-08-2013, 08:56 PM   #40
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Furnace clicking noise, blower runs continuously


Seems to be running fine now. I still haven't changed the thermostat yet. I noticed the burner would stay on a little longer than usual before the blower kicks on and when it kicks on it makes sort of a bang but I've heard that before. I adjusted the fan differential on the limit switch and it seems to be ok now.

Is it normal on an old furnace like mine for the burners to be on for several minutes before the blower kicks on? I read that the blower should kick on in about 60-90 seconds after the burners come on but thats on newer furnaces. On mine, the burners come on for about 5 mins before the blower kicks on. Normal or needs adjustment?

Update, after the furnace ran a couple cycles the blower comes on about 2 mins after the burners come on which looks to be the normal operation for an old furnace like mine. I guess the furnace was pretty cool initially, that's why it took almost 5 mins to warm up before the blower kicked on.


Last edited by Spydey; 01-09-2013 at 06:10 AM.
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