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Hot topics: Troubleshooting for the nest



The Doityourself.com forums have conversations between more than 250,000 experts and beginners in over 120 categories, so during the week we will mark a conversation that can help with your next project. This transcript has been easily edited.

Original post: Heat does not work after replacing old 7-wire for Nest

lijoe408 Member

Hi, I have recently replaced a very old thermostat for a new housing unit . The AC worked well, but I found that with the heater, until the ignition is switched on but not blowing hot air. I have looked at the old installation and everything seems to have been connected in the same way to the best of my ability. Is there something wrong that I miss?

Thanks.

  thermostat cable

  open nest thermostat

PJmax Group Moderator

Welcome to the forums

The wiring looks right. Tells about the oven.

The thermostat usually requires heat and the oven turns on the fan.

In AC mode, the thermostat controls the fan.

Make and model would be good. The ID tag is located on the side wall near the burner.

lijoe408 Thread Starters

Thanks. I looked around the oven but there was no model number. There is a sticker that looks like it was worn a long time ago because the unit is quite old. It's a Lennox pulse oven.

 oven panel

roughneck77 Member

Not to avoid your original question, but the pulse is very old at this time.

I have worked with many.

My first question when I see one is when was the last time the heat exchanger was tested? There is a very specific test that needs to be done to verify that it is not cracked.

lijoe408 Thread Starter

Not sure about the heat exchanger. This is a home I rent. Any reasons you can think of why it doesn't blow heat?

I should mention that I have never used the heat with the old thermostat before. The only thing I have ever used is AC and it has gone well with the nest.

PJmax Group Moderator

The pulse ovens have undergone recalls and safety divisions. Most are no longer used.

Those checked every year.

You as a tenant should not change the thermostat in a rental unit.

roughneck77 Member [19659005] https://m.youtube.com/watch?v=pBttclAIyKA

As mentioned above, you should not do any work or change the equipment as a tenant.

That thermostat is still not so good, they have a long history of problems.

Ask your landlord when was the last time the oven had a check. It is required with these ovens and your safety.

lijoe408 Wire Starter

Good to know on the pulse furnace. I already had the thermostat and google home setting before. I asked the landlord if I could replace it before I moved and was given written permission to do so. The previous thermostat was extremely worn and old.

PJmax Group Moderator

These pulse ovens were ahead of their time. Many had electronically controlled fan motors. Usually, the fan is controlled from the oven plate via a time function in heating mode. There are other methods listed as alternatives depending on the exact model. The manual below is for one of the regular pulse series.

Lennox G21 pulse.

roughneck77 Member

I would worry about making sure the oven was sound first before I tried to make the nest work.

The other thing to consider is the lack of available parts for the pulse these days (many of them obsolete) combined with the fact that the estate has known that sometimes it causes damage to electronics in equipment.

I have had a Nest card myself and cause a board error, more than once.

I know that these devices are very popular with the DIY crowd, but I do not like them for the problems they have caused my clients. in the past.


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