Easy
15-30 minutes
Control Board
Flame Control Assembly 21866
OEM part for: Heatstar, Mr. Heater
Part Number: 21866
$32.98
In Stock
Ships within 1 business day 
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Compatibility
This Flame Control Assembly will fit the following 7 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 7 of 7 matching models.
Heatstar
Mr. Heater
7 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Heatstar
- Mr. Heater
This item works with the following types of products:
- Heater
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Flame Control Assembly
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Perfect fit and function
Quick replacement and now my machine works great!
Guest -
January 19, 2021
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
The heater had developed a shutdown problem and had fuel in the tank, a flame in the chamber and was not over heating.
Robert - December 9, 2015
👍 5 of 6 people found this instruction helpful
Tool Type
Heater
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Nutdriver, Nothing else was used.
Parts Used
This is an easy repair. The Flame Control Board is identical to the existing one and is a pin-for-pin replacement. 1) After removing the line cord plug from power outlet, remove the screws holding the decorative panels on the sides and remove the screws that hold the Flame Control board in place. 2) Remove the leads from the push-on terminals on the board and the photocell connection. Note all connection points. 3) Replace the connectors and replace the screws holding the board and side panels. 4) Apply power and turn the unit on. That's it.
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Burnt out the circuit board.
Joseph - December 19, 2017
👍 2 of 3 people found this instruction helpful
Tool Type
Heater
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Removed the board and replaced it with a new one. Plugged in the wires on the board. Plugged it into 110 and it worked perfect. Also the shipping was really fast. Thank you!
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Heater wouls start and run for about 30-60 seconds then automatically turn off. It would turn back on if I turned the powere off then on. But it would only run for a few seconds then turn back off.
brad - January 22, 2021
Tool Type
Heater
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers
1. Removed control plate.
2. Removed top cover of heater.
3. Removed 2 screws from high limit control. Used pliers to pull tabs (I did not want to break wire connectors). Placed wires onto new high limit control then screwed control backnin place.
4. Removed screws holding flame control assembly. Pulled one wire off at a time with pliers, hooking each wire to new assembly one at at time as they are removed. Secured new assemly to heater with screws.
5. Replaced top cover and secured with screws.
6. Replaced control panal with screws.
7. Heater now stays on until desired temperature (using thermostat knob).
2. Removed top cover of heater.
3. Removed 2 screws from high limit control. Used pliers to pull tabs (I did not want to break wire connectors). Placed wires onto new high limit control then screwed control backnin place.
4. Removed screws holding flame control assembly. Pulled one wire off at a time with pliers, hooking each wire to new assembly one at at time as they are removed. Secured new assemly to heater with screws.
5. Replaced top cover and secured with screws.
6. Replaced control panal with screws.
7. Heater now stays on until desired temperature (using thermostat knob).
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Thanks for voting and helping fellow customers!
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
