Question about Universal ICP Heil Tempstar 10 12 KW Heat Sequencer Relay 1150022 751292 Furnace Sequenser

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Need schmatic for circut board

Hk42fz0433812 board schematic diagram is needed to troubleshoot board

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There should be 24-28v at the W terminal coming from the board to the sequencer. No voltage, replace the board. Make sure the thermostat is calling for heat and there's 24-28v on the t-stat's W terminal first or you'll never find it on the board.

Posted on Dec 08, 2013


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Hi William,

If your problem is a continuous green blinking led light and will not turn on, this is an indication that the DM of your unit try but hasn't booted up and stuck to this fault.
If you have checked fine the fuses on the DM power supply board, you have to check/replaced also the electrolytic capacitors on that board.

11_1_2011_12_36_04_am.jpg has a repair kit for your unit (DM power supply board) that includes these parts.

If you've already replaced the capacitors on that board but still the symptoms still persist, I would advice you to check/replaced the capacitors on the power supply board feeding the DM power supply board. Check also the pico fuses and bad solder joints (cracked, cold, dried solder). Resolder the joints that look suspicious.
Yes, your model has no complete schematic diagram downloadable online. I have a copy of the repair manual that includes the schematic but not a complete one. The power supply's schematic shows only the major parts and the output voltages of the board. Same as on the DM's power supply.
Email me at, I will send you the copy of the repair manual.

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no chance at getting the schematic but trace the tracks for the battery to the 5 v reg. is the radio totally dead, check the internal fuse and a 5 v reg.

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