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Post by joecamper on Dec 8, 2014 13:11:34 GMT -5
I sure wish it would be a simple cure. I've researched this really thoroughly. The local dealer has been real cooperative is looking over my ideas and giving them a try. I'm just fed up with it.
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Post by rvclark on Dec 10, 2014 18:31:01 GMT -5
As mentioned above you may want to change out the flame sensor and the temp limit switch. Lot cheaper then replacing the whole furnace. Best of luck
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Post by joecamper on Dec 13, 2014 20:20:50 GMT -5
I really do appreciate all the suggestions, however I think I can rule out the temp limit switch. Here's why: When the thermostat calls, you can hear the fan start up then an obvious "click" when the furnace calls for propane. If nothing happens, it repeats this sequence at about 15 seconds or so. If nothing still happens, it will try again ... a total of 3 times. If it never fires off after 3 attempts, it goes into lockout. Turning the heat option off and back on (at the thermostat) resets the furnace and you can try again. This is what is totally random. I hear the click and can easily hear when the furnace actually starts the burn sequence. It may start on the first click, maybe on the second click or third click ... or not at all. Totally random. Once when it was faulting repeatedly, I turned the thermostat back on and ran out to see what was happening ... I could smell propane and that got me pretty concerned when it failed to light. My understanding is the 15 second delay is to clear out any propane that wasn't ignited ... at least that seems to happen. Now, if the flame sensor (and that makes sense to me to be the cause) was a problem, why isn't it always failing to ignite? Also, the last time I took it in for service, I asked them to specifically check that and they "said they did" ... I have no way to know for sure.
So, that's the weird part. Bought this new in late 2011 and this issue has occurred off and on the entire time. I got to where I would lay awake all night wondering if it would ignite or not, not a lot of fun.
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resorter
Newbie RV’er
On Holiday
Posts: 11 
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Post by resorter on Dec 17, 2014 10:38:36 GMT -5
If you have access to u tube there are a lot of videos explaining the operation of the suburban sf 42 furnace. This link has a good explanation of what happen during ignition. www.youtube.com/watch?v=cLDUrkL19Fw |
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Post by buoyantc on Dec 19, 2014 19:46:12 GMT -5
When you hear the gas valve click on can you tell if there is actual ignition? In the case I previously spoke of, there was ignition, however before the sensor could detect the heat, the gas valve was shut down as if no ignition. It was all due to a film on the sensor that delayed heat transfer. Sorry to repeat this if you've already been there,done that.
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Post by joecamper on Dec 20, 2014 13:04:04 GMT -5
That's one that I hadn't heard of. I may give it one more try.
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Post by joecamper on Apr 16, 2015 13:50:53 GMT -5
Ok, the issue has been rectified. Note that I didn't say it had been fixed. I finally gave up and bought a new heater (which has probably run through about 50 successful "first click" starts). I'm currently working with KZ on some sort of compensation since the old heater obviously was malfunctioning.
Thanks to all for the suggestions.
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Post by joecamper on Jun 16, 2015 22:25:39 GMT -5
Good things come to those who persevere. Recently there was an RV show here and a rep from KZ was here and I discussed my issue with the Durango. He suggested that the local dealer send the old furnace to KZ along with the history they have accumulated. I might mention that the sales guy that I have always had a good relationship with helped me with the rep. Lo and behold, they agreed that the furnace was defective and reimbursed me the cost of the new furnace and for the labor for the swap of the unit. I'm finally happy and glad that KZ stepped up to the plate.
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Post by johnr on Jun 17, 2015 9:12:32 GMT -5
Nice! Glad to hear everything worked out!
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