Question about Honeywell R7284U1004 universal electronic digital oil primary

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No LED display on Honeywell R7284u1004

I have domestic hot water working on Carlin Oil-fired boiler, but no heat. When I press the "i" button there is no LED display. Boiler PSI is just below 30, so no low water level issue. I can't get the oil primary to work for "call for heat,"

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Posted on Jan 02, 2017

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SOURCE: what would the correct high and lo and diff

I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

Posted on Apr 07, 2009

  • 148 Answers

SOURCE: Honeywell ST6400C - hot water not working

some digital thermostats do no not work with zone valves is this a new thermostat that you had installed

Posted on May 10, 2009

Therinnaiguy
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SOURCE: what is the recomented settings for high and low

180 with a differential of 15 or 20. So 180 high and 160-165 on low.

Posted on Nov 03, 2009

Testimonial: "Thanks"

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SOURCE: Honeywell ST6400C programmer

Hi yes sound like it not working on hot water only it would check ou the wiring on this side

Posted on Feb 18, 2010

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What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

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Have an oil fired boiler for baseboard heat and it also has a tankless heater for domestic hot water. No heat being called for only getting hot water for use. Boiler goes to 210 degrees before it knocks...


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Honeywell ST6400C programmer


Hi yes sound like it not working on hot water only it would check ou the wiring on this side

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