The best LH33ZS004 hot surface ignitor depends on your furnace’s exact model and the replacement part numbers it accepts. BlueStars is best for shoppers seeking several listed part-number replacements and included mounting nuts; Dreyoo supplies electrical specifications and dimensions; the Carrier-family kit includes a flame sensor; FENDITEK lists key electrical ratings; and Robertshaw is an option to investigate when its limited listing details match your needs. Confirm the existing part number and furnace model before ordering.
| Product | Best For | Details To Compare |
|---|---|---|
| BlueStars LH33ZS004 Igniter | Multiple replacement numbers | Electrical ratings and mounting nuts |
| Dreyoo LH33ZS004 Ignitor | Buyers checking size and ratings | Dimensions and operating specifications |
| Ignitor With Flame Sensor | Buyers seeking two components | Listed furnace models and sensor part numbers |
| FENDITEK LH33ZS004 Ignitor | Buyers comparing electrical ratings | Replacement numbers and specifications |
| Robertshaw Direct Replacement | Buyers considering a named brand | Confirm compatibility and electrical details |
BlueStars LH33ZS004 Igniter
Best for: Buyers who want a replacement listing that names several LH33ZS part numbers and includes mounting hardware. The package contains one igniter and two ceramic mounting nuts.
The listed replacement numbers are LH33ZS004, LH33ZS001, LH33ZS002, and LH33ZS003. The product is described for Carrier, Bryant, Payne, Day&Night, GE, and Hotpoint furnaces. Its stated specifications are 116 VAC ±1 at 60 Hz, steady current of 2.7–3.9 A, cold resistance of 40–200 ohms, and maximum operating temperature of 2,650°F.
BlueStars says the igniter heats in under 40 seconds and notes that color change during use is normal. It also describes protective packaging intended to reduce shipping damage. It is a useful choice when the old part number matches one of the listed replacements.
Limitation: Confirm the furnace model and electrical requirements before ordering; a shared replacement number alone may not establish fit for every furnace.
Dreyoo LH33ZS004 Furnace Ignitor
Best for: Buyers who want the listing to provide both electrical specifications and approximate part dimensions. Dreyoo identifies this as a direct replacement for part number LH33ZS004 and says it is compatible with many Carrier, Payne, and Day furnaces.
The stated electrical details are 116 V AC at 60 Hz, steady current of 2.7–3.9 A, cold resistance of 40–200 ohms, and a maximum working temperature of 2,650°F. The listing says the temperature rises within 36 seconds. Approximate measurements are 8.3 inches long, 2 inches wide, and 1.1 inches thick.
Those measurements can help buyers compare the replacement with an existing component, but they do not replace checking the furnace model or part number. Choose this option if those specifications match the requirements for your equipment.
Limitation: The supplied replacement-number information names LH33ZS004, rather than listing the additional LH33ZS001–LH33ZS003 numbers named by some alternatives.
Ignitor With Flame Sensor
Best for: Buyers looking for an ignitor and flame sensor together. The listing describes the sensor as monitoring combustion and sending detection information to the furnace control system. This makes the package relevant when both components are being considered for replacement.
The ignitor is listed as a replacement for LH33ZS004, LH33ZS003, LH33ZS002, LH33ZS001, and 41-409. The listed furnace models include several Carrier, Bryant, Day & Night, and Payne series, such as 330AAV, 333BAV, 398AAV, 58PAV, and 58WAV. The sensor replacement numbers include LH680014, LH33WZ515, LH33WZ511, LH680012, LH680534, and LH33WZ517.
Choose this option if the furnace model and both component numbers match the listing. Its broader parts bundle distinguishes it from ignitor-only options.
Limitation: The provided product details do not state electrical ratings or dimensions for the ignitor, so compare those requirements separately when needed.
FENDITEK LH33ZS004 Ignitor
Best for: Buyers comparing a straightforward LH33ZS004 replacement by electrical ratings. FENDITEK lists steady current of 2.7–3.9 A, voltage of 116 VAC ±1 at 60 Hz, cold resistance of 40–200 ohms, and maximum operating temperature of 2,650°F.
The listing gives LH33ZS004, LH33ZS003, LH33ZS002, and LH33ZS001A as replacement numbers. It also associates the ignitor with common furnace symptoms such as a furnace not heating, a burner that needs to light, or gas that does not flow without burner ignition. These are listing claims, not a diagnosis: similar symptoms can have other causes.
Choose this product when the existing part number and electrical specifications align with the listed details. It offers a compact set of replacement numbers and ratings for side-by-side comparison.
Limitation: The listing does not provide furnace model examples or physical dimensions in the supplied information. Check fit before purchasing.
Robertshaw Direct Replacement Ignitor
Best for: Buyers considering a product named as a direct replacement for Carrier, Bryant, and Payne furnaces with OEM part LH33ZS004. The supplied title gives the intended application, while the product details identify model number CECOMINOD002711.
The provided specifications also include package dimensions of approximately 6.1 inches long and 3.1 inches wide. These are package measurements, not stated ignitor dimensions. Unlike the other options in this selection, the supplied details do not give electrical ratings, operating temperature, or a list of additional replacement part numbers.
This product may be worth comparing when its part identification matches the old ignitor and furnace documentation. Verify the exact replacement number and electrical requirements using the equipment information before deciding.
Limitation: The available details are limited. Do not use package dimensions as a substitute for confirming component fit or electrical compatibility.
Buying Guide: How To Choose An LH33ZS004 Ignitor
How do you confirm the correct replacement?
Start with the number printed on the existing ignitor or its packaging, then compare it with the replacement numbers in the product listing. Check the furnace’s model information as well. Some listings name multiple related part numbers, while others identify only LH33ZS004. A listing’s broad brand or model-family description is not a substitute for checking the specific equipment.
If you cannot read the old part number, use the furnace documentation or contact a qualified HVAC professional with the furnace model. Do not choose solely by appearance: the listings differ in stated voltage, current, dimensions, included components, and replacement-number coverage.
Which specifications should you compare?
Compare voltage, frequency, steady current, cold resistance, and maximum operating temperature when these values are available for your furnace and replacement. BlueStars, Dreyoo, and FENDITEK list 116 VAC at 60 Hz, 2.7–3.9 A, 40–200 ohms cold resistance, and a 2,650°F maximum operating temperature. Dreyoo also gives approximate ignitor dimensions and a stated heat-up interval.
Do not assume every product has identical specifications just because it is associated with LH33ZS004. The Robertshaw information supplied here does not state those electrical ratings, and the ignitor-and-sensor listing does not provide them either. Look up the equipment requirements before ordering those options.
Should you buy an ignitor-only part or a sensor bundle?
An ignitor-only replacement is the simpler comparison when the known failed component is the ignitor and the part number matches. The product with a flame sensor may suit buyers who are also replacing or checking that component, but the sensor’s inclusion does not prove that it is needed. Confirm its part number and the furnace’s requirements before selecting a bundle.
What should you check before installation?
Hot surface ignitors are fragile components, and furnace work involves electrical and gas equipment. Follow the manufacturer’s service instructions and disconnect power as directed before inspection or service. Avoid handling the heating element unnecessarily. If you are uncertain about diagnosis, wiring, safe access, or installation, use a qualified HVAC technician.
A furnace that will not heat may have causes beyond a failed ignitor. The product listings describe ignition-related symptoms, but symptoms alone do not confirm which component has failed. A proper diagnosis can help prevent replacing a working part or overlooking another problem.
How should you compare product listings?
- Part-number coverage: Prefer a listing that explicitly names the number on your existing component.
- Furnace identification: Match the model or series where the listing provides one.
- Electrical details: Compare stated ratings with equipment documentation.
- Package contents: Check whether mounting nuts or a flame sensor are included.
- Dimensions: Distinguish actual component measurements from package measurements.
- Missing information: Seek confirmation when the listing omits key fit or electrical details.
Frequently Asked Questions
What does LH33ZS004 refer to?
LH33ZS004 is a furnace hot surface ignitor part number used in the replacement listings above. Confirm that the number matches your existing part and furnace requirements before ordering.
Can LH33ZS003 or LH33ZS002 replace LH33ZS004?
Several products in this selection list LH33ZS003 and LH33ZS002 as replacement numbers for LH33ZS004. Compatibility still depends on the specific furnace; verify the model and the listing’s complete replacement information.
Which option includes a flame sensor?
The third product in this selection is described as including a flame sensor. Its listing provides separate replacement numbers for the ignitor and sensor, which should be checked against the furnace.
Does a furnace that will not heat always need a new ignitor?
No. A no-heat or ignition problem can have causes other than the hot surface ignitor. The symptom alone is not enough to identify the failed component.
What electrical ratings appear most often in these listings?
BlueStars, Dreyoo, and FENDITEK list 116 VAC at 60 Hz, a steady current of 2.7–3.9 A, cold resistance of 40–200 ohms, and a maximum operating temperature of 2,650°F. Check your furnace documentation rather than assuming those values apply to every replacement.