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Modine® Terminal Board with Time Delay Relay (HD30 - HD75)

, 3H36849-1
QC Supply Part #: 20886
Shipping: Standard
Availability: In stock

Terminal Board with Time Delay Relay for Modine Hot Dawg Heaters (Models HD30 - HD75).


All installation and service of these units should be performed by a qualified installation and service agency including the use of Modine’s installation and service manuals which are specifically intended for use by a qualified installation and service agency.

(3H36849-1) Terminal Board with Time Delay Relay for Modine® Hot Dawg® Hot Surface Ignition Heaters (Models HD30 - HD75).

Works With the Following Models:

  • HD30AH0134
  • HD45AH0134
  • HD60AH0134
  • HD75AH0134
  • HD30AH0174
  • HD45AH0174
  • HD60AH0174
  • HD75AH0174
Brand Modine
Manufacturer Part Number 3H36849-1

Manuals & Resources


Customer Reviews

  • 5 Stars

    Fan delay relay board

    Review by on Mar 19, 2017

    After several years of use my Hamilton 45,000 btu gas garage heater quit working, so I started trouble shooting. The flame came on for about a minute or two then it would go out,and it would do it 3 times and then it would go into lockout mode. I replaced the flame sensor and it worked for awhile then it started doing the same thing and the code for the flashing lite on the gas valve indicated the flame roll out or limit switch was faulty so I replaced those and once again it worked for a short time. The fan was not working. After installing the new fan relay board heater is working great.

  • 4 Stars

    Good option

    Review by on Jan 28, 2017

    Tech offered a good affordable, honest option. Part arrived fast and with good instructions.

  • 5 Stars

    Good experience

    Review by on Jan 12, 2017

    Quality product and instruction sheet. Arrived 1 day prior to anticipated.

  • 5 Stars

    control board

    Review by on Dec 19, 2016

    I needed a control board for a Modine gas fired heater and found one online at QC Supply. The board was delivered quickly and was reasonably priced. Very happy with the purchase.

  • 5 Stars

    All went as planned.

    Review by on May 16, 2016

    Received it on time and was the right part.

  • 5 Stars

    Great service

    Review by on Jan 24, 2016

    Received my relay boards in a very short time . Part was exactly the same as the factory. Ordered same part almost a year ago and the time relay module went again. New one cured the problem.

  • 5 Stars

    very good

    Review by on Jan 22, 2016

    It was exactly like the factory part. wired easy and fixed the problem. The unit would purge, then burners would fire, then kick off with out kicking on the main fan. This fixed it!

  • 5 Stars

    Got heat now

    Review by on Jan 21, 2016

    Fan timer relay quit working on my moline hot dawg. QC supply had the best price. Got it fast. Easy to follow instructions. Heater working like a charm thanks to QC supply

  • 5 Stars

    Easy to find and was exactly what I needed.

    Review by on Jan 14, 2016

    I found it very easy to find what I needed from your web site and it was exactly what I needed to fix my heater. Thanks

  • 5 Stars

    All went well we have heat

    Review by on Jan 14, 2016

    Part fit perfect and solved heater problem. The shipping time frame very good also. The card should be shipped with more bubble wrap to protect card components .

  • 5 Stars


    Review by on Dec 5, 2015

    Installed within 5 minutes. Worked perfect. It solves the issue of the main fan not turning on. Couldn't be happier.

  • 5 Stars

    very satisfied

    Review by on Oct 24, 2015

    slight modification, works perfectly!

  • 5 Stars

    Perfect fit

    Review by on Oct 15, 2015

    Part fit perfect and solved issue. Good instructions and fast delivery.

  • 5 Stars

    Working perfectly

    Review by on Oct 3, 2015

    This part replaced the one that went bad a couple of years ago. I waited to give my review to see if it would hold up and it did! There was a problem with the old board going bad and this new one seems to succeeded. Very accessible and easy to replace. I took a couple of pictures of it before exchanging it out to make sure my wires were routed right.

  • 5 Stars

    Highly recommended.

    Review by on May 14, 2015

    Quick shipment and excellent instructions. This board replaces the existing board and TDR. Easy installation. My heater is back to normal operations. Thanks QC supply.

  • 5 Stars

    modine terminal board

    Review by on Mar 2, 2015

    works great

  • 5 Stars

    Prompt shipment

    Review by on Feb 6, 2015

    The only thiong I can post as a review is the promptness of shipping. The part actually got here a day ahead of promise.

  • 5 Stars

    Perfect fit

    Review by on Jan 21, 2015

    Got it in 2 days and was perfect fit. Thanks!

  • 5 Stars

    Modine control board

    Review by on Jan 2, 2015

    Replacement part came quickly and was very easy to install! Heater is working better than ever, I have had many problems every year with the fan control of this unit, I hope this corrects the problems finally! Sure seems to work great at this time!
    Thanks for your quick turn around!

  • 5 Stars

    Excellently engineered module

    Review by on Dec 15, 2014

    This module replaces two components, a very strange fan timer and an interconnect board. The very strange timer is prone to short life and is hard to obtain an exact replacement. QC Supply delivery is fast while keeping me informed of shipment and delivery date. Excellent service, thank you.

  • 1 Stars

    Works Intermittant

    Review by on Dec 14, 2014

    Well, the part worked fine for day one, then sometimes it works and other times it does not. the fan comes on as it should but does not shut off. when i restart the heater the same thing happens. i think the part is defective. It looked old when I received it. I am very dissatisfied. Sorry to say

  • 5 Stars

    great dervice

    Review by on Dec 13, 2014

    got my spare parts now just in case...

  • 5 Stars

    100% Satisified

    Review by on Dec 13, 2014

    Excellent shipping. Part was perfect. Will shop again. :)

  • 5 Stars

    Very Happy and Warm again!!

    Review by on Dec 11, 2014

    Very simple to install, instructions were superb and thank you for the new wiring schematic. Heater now works better than before. Shipping was fast.

  • 4 Stars

    product repair my heater

    Review by on Dec 4, 2014

    shipped quick , fit well and instructions very good

  • 5 Stars

    This fixes your fan delay timer relay problem

    Review by on Nov 26, 2014

    Great price!
    Installed as per instructions and my heater works properly now!
    Thanks QC Supply

  • 5 Stars

    Problem Solver

    Review by on Nov 14, 2014

    Fan relay crapped out on my heater. After trying to research the problem, I found the QC website. In reading the reviews for this product, I knew this was the part I needed. Part arrived in three sort days...AND...heater is up & running! Thanks QC Supply!!!

  • 5 Stars

    Identical replacement part quick fix. Shipped and arrived quickly.

    Review by on Apr 6, 2014

    Fixed fan not coming on

  • 5 Stars

    Hot Dawg Modine Terminal Board with Time Delay Relay (HD30 - HD75)

    Review by on Mar 15, 2014

    Second time I have ordered from QC Supply. I bought this Modine Terminal Board with Time Delay Relay (HD30 - HD75) to replace the broken part in my Hot Dawg heater. This part arrived as expected and the instructions on how to install are simple. Great part if you have a failure and this fixes it.

  • 5 Stars

    Just as I expected!

    Review by on Mar 12, 2014

    Right part, fair price, same day shipment, packaged well, received in great shape. Would order from QC again!

  • 5 Stars


    Review by on Mar 6, 2014

    Everything went great, from ordering to receiving the part in 2 days!Install took about 10 minutes.

  • 5 Stars

    Great shopping experience.

    Review by on Feb 14, 2014

    Worked great and price and shipping cost were excellent. Phoned for info on shipping cost and they gladly shipped USPS priority. Most others only ship UPS which is outrageous for Alaska.

  • 5 Stars

    Great service

    Review by on Feb 12, 2014

    After waiting for 2 weeks for this part from a local heating company I went on line and ordered from QC and received it in 4 days at about 1/3 of the cost from the heating company The instructions that came with the unit were printed in 2003 and were for upgrade of an earlier model so that was a little confusing as my unit was a 2004. It talked of removing a purple wire which I did not have on my unit. Once I determined the circuit board was exactly identical to the existing part and the instructions were for upgrading older units than mine; it was all plug and play. I had my heater up and running in about 10 minutes total.

  • 5 Stars

    Eliminates fan timer problems

    Review by on Feb 6, 2014

    This board is a great upgrade from the old thermal timed relay. The instructions supplied are clear and accurate. They also include a new wiring diagram sticker for inside the unit. Total installation time is less than 15 minutes.

  • 5 Stars


    Review by on Feb 2, 2014

    I utilized this product to replace the circuit board and fan delay relay on an 17 year old Hot Dawg heater mounted in my garage. Part shipped quickly, came with easy to follow instructions, and fixed the problem of an intermittent circulation fan. Replacement took less than 30 minutes. QC's price was the cheapest! Great experience.

  • 5 Stars

    the exact part I need

    Review by on Jan 21, 2014

    the exact part I need

  • 5 Stars


    Review by on Jan 21, 2014

    Great price , quick shipping, fantastic instructions, installed it myself in about 15 minutes, furnace works like new again.

  • 5 Stars


    Review by on Jan 16, 2014

    fit and worked great

  • 5 Stars

    Great Replacement

    Review by on Dec 12, 2013

    Great Replacement for the old control board and relay on the Modine heaters.

  • 5 Stars

    Great technical help from QC tech's

    Review by on Nov 28, 2013

    Received in a timely fashion part fit and functions p[perfectly, good price best of all was the one on one from QC technicians prior to ordering.
    Overall great experience.

  • 5 Stars

    Good Product

    Review by on Nov 14, 2013

    The product fit as per the instructions and worked the first time. It arrived as expected.

  • 5 Stars

    Finally Fixed!!

    Review by on Oct 31, 2013

    I have a Hamilton heater too and had the same problem with the fan not turning on all the time. Found out it's the same as a Modine heater and ordered the board. QC Supply has great prices, fast shipping. The instructions were clear and the part was easy to install. My heater now works like new again.

  • 5 Stars

    Heated Garage Again

    Review by on Mar 15, 2013

    I have a Hamilton WGH garage heater and from searching the web, this Modine part is the same as the ones being offered for the Hamilton, but at a better price. My Hamilton was facing the same problem, fan was not coming on, heat exchanger glowing red and then tripping out. This part was the cure. Awesome service and delivery.

  • 5 Stars

    Very happy

    Review by on Feb 17, 2013

    Mechanically, the board went in easy, would have been easier if I had read the instructions. Doing the electrical connection was very simple. Glad I made the installation. The time from order to receiving was delightfully short! Thanks.

  • 5 Stars

    Good so far

    Review by on Jan 12, 2013

    Installed in my Hot Dawg and so far so good. Have not used it a lot yet.

  • 5 Stars

    Glad we could get the part!

    Review by on Jan 12, 2013

    Our Hot Dawg heater wasn't working and my husband found the diagram inside of all the parts and numbers, he went on the internet and the number & part had changed, so it showed the updated part and number to order. It was that easy. We had heat back in less that a week!

  • 5 Stars

    great service

    Review by on Dec 27, 2012

    This part must be an updated version and will require some rewiring but the board was not required at this time. The part arrived right on time. Thank you.

  • 5 Stars

    Excellent shopping experience

    Review by on Aug 23, 2012

    Fast delivery, correct part, easy to self install. Very satisfied.

  • 5 Stars


    Review by on Jun 25, 2012

    Very fast shipping. Great price.

  • 5 Stars

    Go Big Red!

    Review by on Mar 19, 2012

    Great price, fast delivery, easy install, wonderful people to deal with! Thanks, Elaine!

  • 5 Stars

    Great deal

    Review by on Mar 12, 2012

    Much better product than the original. Easy to install with great instructions, schematic and wiring diagrams. Have not used it very much for reliability, but it should be better than the original design.

  • 4 Stars

    All done

    Review by on Mar 3, 2012

    Works great, makes me wonder if this if a common failure with these heaters. Ordered it on the website and got it pretty fast. A better price than other places I checked and free gloves, gotta like that. The only problem is... I didn't understand the tax charged on an item sent out of state?

    ***QC Supply Response***
    I do not have your order details so I can not determine what state we shipped to but we must charge tax when shipping to any state where we have a business presence, which is Nebraska, Missouri, Oklahoma, Iowa, North Dakota, South Dakota, Minnesota and Wisconsin.

  • 5 Stars

    fixes fan delay problems

    Review by on Feb 27, 2012

    15 minutes to install and fixed problem I had with the fan not coming on in time to prevent the high limit switch from tripping. recommended if you are having trouble like I did on my 2001 HD75 unit. Fan goes on now within 10 to 15 seconds after flame up. No more glowing hot heat exchanger tubes. QC sent product quickly and the best price on the internet.

  • 5 Stars

    Excellent Product and Great Service

    Review by on Feb 23, 2012

    Arrived within 2 Days Excellent easy to follow instructions Great Company All Businesses should operate like this

  • 5 Stars

    Great Service

    Review by on Jan 22, 2012

    Old time feel with old fashion values. Quick delivery and a special thanks to Jerry for his friendly conversation.

  • 5 Stars

    fixed the fan not working

    Review by on Jan 12, 2012

    QC had the best price on this part...when the stops working due to a bad time relay.this updated part will fix your problems....it took about 10 min to install.the relays all went bad on these units..once you install the updated board then it will last...i will use qc again...they are very nice people to talk to and do bussiness with...eddie. toms river. nj.

  • 5 Stars

    Great repair!!!

    Review by on Dec 23, 2011

    I did a bench test of my Fan Motor and it worked great. Isolated the problem to the Fan Delay Relay with a jump through it. QC had the part as an updated circuit board with Delay Relay included. Simple install with great Hot Dawg supplied instructions for the upgrade. I'm back in the heat!! A great pair of gloves to boot!!!! Thank you QC.

  • 5 Stars

    Works well

    Review by on Dec 14, 2011

    Product shipped on time, was easy to install and works well.

  • 5 Stars


    Review by on Nov 26, 2011

    shipped quick, works great, and a free pair of my favorite gloves who could ask for more. will look here first for other parts, as needed.

  • 5 Stars

    Just what I needed

    Review by on Nov 4, 2011

    I had a heater company check to see what was wrong with my heater. Turned out to be the circuit board. They quoted me $437 and a week to fix the heater. I got the part for $82 including shipping from QC in 3 days. I installed it myself and saved $350.

  • 5 Stars


    Review by on Jun 11, 2010


  • 5 Stars

    Works Great

    Review by on Jan 14, 2010

    I bought this to replace a broken part in my Hot Dawg heater. Konnie got it sent out to me super fast and the instructions on how to install are simple. Great part if you have a failure and this fixes it.

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