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I have two roof top units. In Toronto and it is very cold.

Customer Question
I have two roof...

I have two roof top units. In Toronto and it is very cold. Got home. One thermostat set to 22 c but inside temperature 16. Unit has no heat coming out of it and error code 56. Can I fix it tonight.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

Yes

Contractor's Assistant: Do you plan on doing the work yourself?

If i can get going tongiht yes. what is an error code 56?

Contractor's Assistant: Anything else we should know to help you best?

Is this a stupid automated reply

Submitted: 8 months ago.Category: HVAC
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Answered in 2 minutes by:
12/27/2017
HVAC Technician: airheatman, HVAC Technician replied 8 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,541
Experience: Furnace, A/C and heat pump specialist.
Verified

What is the model on unit that is not coming on and is the error on board in unit or on thermostat? If on thermostat what is model on thermostat?

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Customer reply replied 8 months ago
its on the unit. lenox roof top.
Customer reply replied 8 months ago
its on the unit. lenox roof top. the unit is on. just no heat.
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Model on the Lennox?

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Customer reply replied 8 months ago
its a big commercial unit. the error code is 56. do you know what that is?
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

I will need the model to be able to pull a legend for the error code and guide you in troubleshooting.It should be on a label on outside panel

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Customer reply replied 8 months ago
its a big commercial unit. the error code is 56. do you know what that is?
can i fix it tonight or do i need to call a service person tomorrow.
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Give me a few moments to see if I can find a Lennox legend 56 on packed units.They are constantly changing so the model would make this a lot quicker. Not being rude, but to ask me what the legend means without knowing the model is sort of like saying I have a Ford with check engine light on.

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Customer reply replied 8 months ago
the error code is listed inside the unit. says GAS UNIT S18(combustion air proof switch 1) is open.
can i do anything tonight or do i need to get a sevice person here tomorrow.
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

If you can do some troubleshooting we might can get it going.Does the small vent motor come on when you call for heat?And do you have a volte meter for troubleshooting?

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HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Unless you are familiar with schematics you are going to be best to call in a Lennox tech.These units are a bit complicated even for me with 48 years in the business as everything is explained through shematics rather than diagrams.See belwo

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