blower on/ no heat

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  #1  
Old 07-10-03, 08:53 AM
kimspig
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Unhappy blower on/ no heat

When the thermostat is turned up to call for heat the fan comes on immediately and no heat comes out of the furnace? It is a high efficiency Whirlpool forced air natural gas furnace with a standard honeywell thermostat (no switch for A/C, just heat). Model 250 Diplomat about 10 years old. Any Suggestions?
Thanks
 
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Old 07-10-03, 09:40 AM
bigjohn
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The normal operating sequence is the burners lite up to warm up the furnace and then the indoor fan comes on. It's possible you may have an open limit switch on the furnace. That would run the fan all the time but shut down the gas valve. Now tell us the truth. You're really Mrs. Claus and live at the North Pole, right? Coz, nobody else in the Northern Hemisphere needs heat in July. he he
 
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Old 07-10-03, 09:52 AM
kimspig
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north pole

I may not be at the North Pole but I can see it from here. 40 degrees last night. Thanks for your reply, Jon.
 
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Old 07-10-03, 01:31 PM
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FURNACE

You didnt say here did the burner come on or try at all when you turned the heat on. By the way you do mean the town of North pole there in Alaska dont you. I have been there in july and had my heater going at night. ED
 
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Old 07-11-03, 10:25 AM
kimspig
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No ignition, just fan blowing. If the power to the furnace is shut off then turned back on (with the thermostat calling for heat) a click can be heard in the furnace about 5 seconds after the power is applied. The fan comes on immediately with the power applied.
 
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Old 07-11-03, 11:38 AM
kimspig
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No ignition, just fan blowing. If the power to the furnace is shut off then turned back on (with the thermostat calling for heat) a click can be heard in the furnace about 5 seconds after the power is applied. The fan comes on immediately with the power applied.
 
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Old 07-11-03, 10:16 PM
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Question More Detailed Info Requested

Hello: kimspig

If the unit recently started acting up so the fan comes on immediately, the possiblity of an open limit switch is very valid.

If the unit has always operated in this manner, it has not wired correctly at installation.

The questions that need to be answered are:

Has the heater always operated in that manner?

Has the heater just started or recently started operating in that manner?

Any repairs done to the unit since the problem developed?

The click you are referring to is most likely the time delay relay activating. Soon as you hear that click the fans starts. If that is the case, 5 seconds is much too short a time. Chances are the part is defective or has been set incorrectly, if it is adjustable.

An excellent source for original replacement parts is your local retail appliance parts store, the local heating dealers and agents retail part stores. Bring the make, model and serial numbers. The info will help to determine the possible problem causes.

Heating Agents & Appliance part stores sell replacement parts for almost every heater brand. The locations for the dealers, agents and retail part stores are listed in the phone book.

Be sure the electrical power to the appliance is turned off, the thermostat is turned down and the gas control valve is in the off postion before attempting any repairs.

Than post back the answers to the above questions. additional help can be provided once the cause of the problem is determined.

Regards & Good Luck, Web Host & Multiple Topic Moderator.
TCB4U2B2B Company Enterprises. Energy Conservation Consultant & Gas Appliance Diagnostics Technician.
 
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Old 07-13-03, 04:21 PM
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i agree

open limit. look for resets on these, little buttons located between the wires going to the discs, there is a reason it tripped, check burners for rust, may just be a nuisance trip, may want to call a tech, have him do a CO test.
 
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