Comfortmaker Heating & Cooling - Recent Questions, Troubleshooting & Support


A pressure switch code means there is an unsafe condition that should be looked at by a competent service tech. Sometimes there is a switch failure, but most of the time there is an unsafe condition.

Comfortmaker... | Answered on Dec 07, 2014


There should be an automotive 3 amp fuse on the circuit board. It should be good, IF you are getting a heartbeat, but check it anyway. Considering it was a storm, I'd look at the grounds. Make sure it is making a good and solid connection to the ground lug. Grounds make freaky problems sometimes.

You mentioned 'fuse box' and not a breaker box. The furnaces of today with their circuit boards require a good ground all the way back to the ground lug in the box. Sometimes they will work fine without, then decide they are not gonna work at all. Sometimes, even a dry ground rod outside the house is the culprit.

Comfortmaker... | Answered on Nov 22, 2014


There are a number of manufacturers that make equipment for many different brands and just have different paint schemes. Rheem and Rudd...one is brown, the other green. Carrier, Day and Night, Payne are the same units with subtle differences. Kenmore, Whirpool, and several others are manufactured by the Heil Quaker Corporation that became ICP a few years back. The list goes on and on.

As a matter of fact, some have the different badges in a baggie delivered in the box so the appropriate one can be place on the unit when installed.

Comfortmaker... | Answered on Nov 22, 2014


I don't know specifically..but just about anything with a 16 seer is going to have a two speed compressor combined with a variable speed blower in the furnace. Some utilize 'inverter technology' and utilize a variable speed compressor to deliver ultra- high ratings. Though available for residential use, they show up mainly in systems used in commercial applications. Daiken, Sanyo, Mitsubishi to name a few...and are usually ductless split systems.

I guess this answer really is of no help.....

Comfortmaker... | Answered on Nov 22, 2014


The 70 stands for 70,000 btu and the 16 stands for 1600 cfm.. Air conditioning requires 400 cfm per ton, so the blower is capable of delivering enough air for a 4 ton a/c unit. However, the blower is is amultispeed and has a 'blower chart' in the manual that will give you an idea of air flow delivered on all 4 (usually) speeds. You wouldn't want to deliver 4 tons of air across a 3 ton coil. That would effect the temperature drop across the coil and also effect humidity removal.

4 tons of a/c is a considerable amount of cooling, so unless you have a large space or extremely high average summertime temps, I would ask a local contractor to do a heat load calculation to properly match a system to your specific needs.

Every area has a 'design temp' around which a system should be designed. Here in the St Louis area, the design temp for the winter is 5 degrees and for the summer its 95 degrees.

70,000 btu in gas equates to 20 kw in electric heat for what its worth.

Comfortmaker... | Answered on Nov 22, 2014


the filter on the side will have a size on it such as 20x20x1 I recommend a fiberglass filter you get better air flow.

Comfortmaker... | Answered on Aug 09, 2014


Most furnace operating on Oil or gas will heat the combustion chamber before starting fan to prevent cold air draft at start-up, can last a minute or two. Eiter the main flame does not come on or the chamber thermostat have fail. Try to modify fan option on room thermostat from auto to on. Cold air coming out: burner problem or no more oil or gas, warm air: burning chamber thermostat problem, leave room thermostat fan option to on until repair.

Comfortmaker... | Answered on Jan 03, 2014


Check power & control voltage to sequencer.

Comfortmaker... | Answered on Dec 20, 2013


If the combustion blower is working the next step in the process would be the pressure switch. Check for plugs in the drain lines or venting. If the pressure switch is working it could be the ignitor.

Heating &... | Answered on Dec 01, 2013


Cliff, this is Teng. Look inside your furnace if there is any flashing code. If your furnace is recently installed it should have electronic control board.

Comfortmaker 7.5... | Answered on Nov 10, 2013

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