Start here — before replacing any parts
Do not assume E10 is universally a failed igniter: verify its meaning on the installed TB2S controller, then check safe external startup conditions.
Hcalory has published conflicting E-code descriptions across heater and controller editions. These pages are research drafts until the TB2S controller-code table is confirmed.
Manual scope: Combustion equipment; require model-specific manufacturer confirmation
Do these checks in order
Follow the steps below and keep a record of what changes after each one. Stop when an actual cause is confirmed.
Shut down safely and let the heater complete cooldown. Photograph the exact displayed code and controller sticker.
Compare this screen with the TB2S original PDF linked by Hcalory; do not reuse an error explanation from a TB2/older-control chart.
When cool, check fuel amount, exterior supply-line bends, power input connections and whether the inlet and exhaust outlets are visibly obstructed.
After correcting a specific external problem, attempt one supervised normal startup in an appropriately installed and exhausted location. Never defeat a flame sensor or glow-plug protection.
If the problem is gone
Heater lights and runs stably after correcting an identified external supply problem: do not replace the glow plug automatically.
If the problem is still there
E10 returns, there is smoke/exhaust leakage, or its definition remains unconfirmed: stop and obtain TB2S-specific manufacturer diagnostics.
Which cause matches your result?
Use these more specific checks only when the earlier steps point to that possibility.
01Confirm this unit uses the referenced E10 definition
Check the TB2S display model and obtain its own error-code chart.
Do not guess that every Hcalory E10 has the same meaning.
02A startup attempt fails
With the heater off, look for insufficient fuel, external power issues or blocked intake/exhaust.
Correct basic external conditions; avoid repeated failed ignition cycles and request service if it persists.
How can I tell it is actually fixed?
Observe complete ignition, safe normal operation and manufacturer-controlled shutdown without repeat E10.
Before buying a replacement part
Controller edition, glow plug and fuel pump specifications need confirmation; no live combustion wiring repair.
Where this guidance comes from
Primary reference: View the manufacturer or manual reference ↗
Applicability: Combustion equipment; require model-specific manufacturer confirmation. Source evidence: Third-party model manual; code may vary by controller.
The instructions are original English troubleshooting explanations derived from the listed technical facts; they are not a verbatim service manual. Do not apply them to an unverified revision.
Important limitation: TB2S fault-code description remains pending direct official revision confirmation.
Editorial hold: The exact fault-code meaning, controller edition, part specification or root cause remains incompletely verified. This page is NOT approved for public indexing as a confirmed repair procedure.