HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hello one thing you may want to check here is the flame sensor. If there is rust or debris or it somehow is shorting to ground you will get this code. Now, the dirty part should not do it but is something has it shorted to ground it will sense flame when there is no flame.
The flame sensor is a tin metal rid near the burner where the flame goes into the heat exchanger. Turn power off before e you do anything. Let me know what you see Richard
I will go take a look.
I should have added, that if I turn the thermostat on, it will ignite and continue to run and heat like normal. The cycling on and off occurs when it appears to me maintaining a constant heat.
The flame sensor, if that is what I looked at, appears to be in good shape. It is a tin refector with a sort of charcoal looking device with two wires attached and the wires go to the board in the bottom chamber.
The sensor is in the box where the gas chamber is at. right?
Please allow me to heat the house back up before I continue. It is running right now and the temp went down pretty quickly. So I will check this out soon I am sure.
I have pulled the sensor. It appeared to have a dirt or carbon type build up on it. Installed in 1998. I cleaned the dirt off with steel wool and put it back in the chamber. I have turned the heat back on and am waiting for a cylce to see if it continues to cycle often.
The system ran through a cycle and 5 minutes later started up again. This time it cycled correctly, or in other words, it ignited the gas and continued to run.
I understand that there might be a way to extend the time on the cycle period so it does not come back on so soon. I will wait to see if the system cycles through and works again one more time, but in the mean time, I am concerned about how soon it kicks back on after running a cycle. I bought a new honeywell theromstat, but do not see any way to set it any different. Can you tell me if there are dip switches I can set that would give me more time between cycles.
Are you there?
I will need to continue this, if you are willing, later tonight. I have a 10 hr. task in front of me today and need to get to KC. Is it possible that you could look over my last correspondence and tell me if there is a way to reduce the time between cycles. (i.e. heat longer and then longer period of time before heat is called for again)
I found dip switches that set heat on delay and heat off delay, but I don't know if these switches are the answer to my question. There are directions for the settings next to the switches.
It is nearing 0 degree here, so I am not terribly concerned about the rapid cycling, but I just don't ever remember it before. Had the system since 1998. I have already accepted your answer, but I plan to add a bonus if you stay with me. Thanks so much.
Thermostat is a Honeywell. It advertises that it has an automatic detection of how long it takes to heat the house when using energy saving settings at night for example, but it did not give an option to set the number of cycles per hour. I think a 5-2-2
When I hold the fan and the up arrow, it must place it in config like you have suggested, but it is not clear to me (no indicators) as to what is getting adjusted. I am not getting a function 5. It goes from function 2 to 13 I think. Do you have a link to a manual I can look at?
Hello I am out of town and traveling and can not get the link to work on this computer. However you can go to Honeywell.com type in the RTH6350 model and it will come up.
On page 14 to 17 is how you do this. Richard
We keep the temp at 68 most of the day. It will cycle, even though the temp always reads 68. So the temp is not dropping that rapidly as to make it go on again, but it must be coming on all the same due to attempting to maintain the temp. I did get it set at function 5 at 5. The system is 90% efficient so I believe you are correct to tell me to use 5 and not the other setting for gas heat high efficient over 90%.
When I installed the thermostat this manual on Honeywell.com site was in the box. Sure wish I knew where it went. Oh well. Since I cleaned the heat sensor, the issue of shutting down unexpectantly has gone away (I have not noticed it and I have listened for it). You were spot on from the beginning. Thanks so much for your help on a Sunday. I hope you keep doing this.