波教授or行家:请教Gas Heater stops working by itself but resetting

R
RomaVacation
楼主 (文学城)

circuit breaker works almost all of time. It gets more frequent so I need to get it fixed. 

Old posting:

https://bbs.wenxuecity.com/fdcj/1821999.html  I replaced induction motor about 2 years ago. 

I could send HVAC company tech over but most likely they will ask me to change the heater

(this one was made in 2006). 

System senses exhause not good enough so shut down the system, either correctly or malfunction.

I guess the following possible causes:

1. exhaust pipe clogging (bad with wind, leaves...). I need to find out where the exhaust pipe goes at the roof or wall. 

2. induction motore not strong or leak (new one put in almost 2 years ago) or 

3. print circuit board problem. ( I plan to buy one online but it could take some to figure out the match)

____________________

怎么弄?

Do I need to get identical control board? amazon store https://www.amazon.com/stores/Carrier/page/BCB33E28-9A7B-4C53-BBD2-25FFB43336D7?ref_=ast_bln 

My system was made in 2006 but there are ones 1st available in 2013. 

(Lol ChatGPT answer: The serial number 3106X25486 of your Carrier furnace indicates it was manufactured in the 31st week of 2006. Based on this, the control board for your furnace is likely HK42FZ018 or a similar model used in units from that year. For accurate confirmation, you should:)

ChatGPT got month of manufacturing about right. 

To get control board soonest, I ordered new upgraded one. Hope it is compatible

ChatGPT says "

The control board for your Carrier furnace, model CNRVP3014ACAAAAA with serial number 3106X25486, should be compatible with part number HK42FZ013. This model is listed as a standard replacement for many furnaces within the CNRVP series. Additionally, some sources suggest HK42FZ014 or other variants like 30148360 may also be compatible, but confirmation of compatibility with your specific serial number is recommended.

To ensure proper operation, it's best to verify compatibility with a Carrier dealer or a trusted HVAC technician. Alternatively, contacting Carrier support directly with your furnace details can provide definitive guidance?"

 

 

 

Previous tenant installed NEST thermostate. A lot of bad comments how this could affect furnace. Any comment?

 

 

b
borisg
what's the model. you said

it stops and reset, what exactly does this mean?

 

s
smlandlord
90% chance bad control board
R
RomaVacation
Resetting circuit breaker. Brand Carrier

HVAC Sytem has safety feature. When exhaust is not good enough, the system would wait a few minutes to restart. I think it is 3 attempts. The system would shut down and won't start again on itself when 3 failed attempts. Once I reset circuit breaker, everything works again. Perhaps a few times per season. Not that big deal but it is now perhaps once a few days. Not tolerable any more to tenants. 

 

 

R
RomaVacation
多谢大地主指教
b
borisg
your sequence should be

1. the induction motor spins;

2. ignitor fires up

3. gas switch on and flame comes

4. blower motor kicks in.

At what stage it fails and loops three times?

R
RomaVacation
Probably between 3 and 4 ( I was wrong). I was corrected楼下

The furnace stops working very rarely so I don't know for sure but I think the exhaust (pressure sensor) check is between 3 and 4. Once there is issue (real or not), the system will reset by itself and wait for a few minutes before repeating 1 to 3. 

千里江山_USA
pressure check应该1和2之间吧
h
huckle4berry
我家昨天也遇到同样的问题,发现是电压断在pressure switch

不知道是pressure switch坏了,还是induction motor老化吸力不够, 天寒地冻的没法等,先把pressure switch bypass暖气跑起来,看火焰的颜色还不错,可能还是pressure switch概率大一点。 

l
learner4ever
前一阵一处多家庭gas furnace老是运行一阵就自动熄火,后来发现是vent的原因

也就是烟囱有问题,疏通清理后就基本不熄火了。我早就对我的contractor是vent clogging的问题但他就是不听,让我白花了许多钱买了许多零件换,后来我坚持让他疏通烟囱,并且说他如果不做,我自己做他才疏通了烟囱。我前后花了近三千,我直接怀疑他是故意的。

R
RomaVacation
Safety interlock. Don't drag fixing it
R
RomaVacation
$3k for what repair?