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    coldatthemoment's Avatar
    coldatthemoment Posts: 1, Reputation: 1
    New Member

    Feb 16, 2008, 08:10 AM
    Intertherm Electric Furnace Blower works in "on" not in "auto"
    I have an Intertherm Electric Furnace E2EB-015AH. I came home from work last night, turned the heat on and it didn't work as advertised. I could hear the relays clicking occasionally so I investigated a little and found the elements are heating up and cycling, the relay inside the thermostat cycles (not repeatedly just when you turn it on and off), but the fan blower doesn't run/hum/make noise. If I put the fan switch on the thermostat, the blower runs full speed and the heat cycles as it should and maintains steady temp in the house.

    I tried turn the fan switch back to auto and it cut the fan off. The fan then came back on at its normal lower speed. The heater cycled off normally it seemed, but when it cycled back on, again there was no blower output. I only got the blower to come on in the normal low speed one time.

    So, the elements heat, the thermostat cycles, the blower runs in "on" position only.

    I have the schematic from Intertherm for this system.

    Any ideas?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Feb 16, 2008, 09:16 AM
    Here is a complete service manual or your furnace.

    Many times a part called a heat sequencer activates the blower in the heat mode. When you switch the thermostat to on for the blower it just bypasses the sequencer. I believe you will find the sequencer defective.
    canex's Avatar
    canex Posts: 1, Reputation: 1
    New Member

    May 26, 2010, 09:10 PM
    Is there a fan switch available for a 10 kw intertherm furnace model E3EB-010H so as to run fan only in summer. There does not seem to be a spot for it as in EH series . IF so how to wire it in
    zerostone's Avatar
    zerostone Posts: 1, Reputation: 1
    New Member

    Oct 3, 2011, 02:45 PM
    I have the Intertherm model e2eb-015hb when I turn the heat on it works but a buzzing noise is heard. Can you tell me what causes this?
    hvaaaac's Avatar
    hvaaaac Posts: 1, Reputation: 1
    New Member

    Oct 6, 2011, 05:06 PM
    Some electric furnces have a 240V contactor for the heat strips, the contactor may not be getting enough voltage due to a bad transformer, or the contactor is just worn out and not getting a good connection.
    carolinatech99's Avatar
    carolinatech99 Posts: 2, Reputation: 1
    New Member

    Nov 3, 2011, 12:31 PM
    Sounds like bad sequencer, since the blower runs in override
    eugenev's Avatar
    eugenev Posts: 1, Reputation: 1
    New Member

    Nov 8, 2011, 10:48 PM
    I have a E2EH-017HA and the thermostat will not allow the fan to come in auto position there fore I am getting no heat. I've changed heat sequencer and it still didn't work what am I doing wrong?

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