HPC Fire · Troubleshooting

HPC Electronic Ignition Error Codes 1-10: What Each One Means

HPC's electronic-ignition (EI) system displays an error code for most problems — either as an LED flash count on the valve-box module or via Error Log on the smart-phone app (HI/LO models). This is the full decoder with symptoms and solutions, grouped by whether YOU can fix it or whether it needs a SERV PRO.

By Ash · Updated November 10, 2026

Editorial review · November 10, 2026

What you need

Phone with the HPC app (HI/LO models) OR visual access to the valve-box LED
Soft-bristle brush (for flame-sensor cleanup)
Soap-and-water leak-test solution

Where to read the code

HI/LO models — primary: Smart Phone app → Error Log
HI/LO models — fallback: Remote Control → count LED flashes
ON/OFF models: Internal Control Module → count LED flashes

Step by step

Code 1 — Ignition Failure
Symptoms: weak or no pilot flame, cold flame sensor. Confirm gas is connected and the shutoff is FULLY ON. If pressure is fine, the flame-sensor tip isn't 3/8" in the flame (SERV PRO), pilot orifice may be clogged (SERV PRO), or sensor copper tubing is kinked (SERV PRO — replace). If you see igniter glow but no flame, the valve box may have a loose or damaged electrical circuit (SERV PRO).
Code 2 — Over Temperature
The internal module cavity is running too hot. First check: is the enclosure vented per the install instructions? Clogged vents is #1 cause. If venting is good, look for unwanted fire in the enclosure cavity — a gas leak or air-mixer back-pressure (LP) can cause combustion inside the enclosure itself (SERV PRO, hard shutdown). Also: too much lava rock or glass on the burner can cause heat spikes. Reapply using HPC standard lava rock (#657) as a base coat, with larger lava or glass only as a top coat.
Code 3 — Thermocouple Error
Flame-sensor hardware fault. Connection loose at valve box (SERV PRO — re-tighten) or sensor copper tubing kinked or broken (SERV PRO — replace). Normal sensor voltage to module is 8-15 mV; outside that = the fault.
Code 4 — Hardware Fault
No pilot flame, no main flame — valve is clicking open but no flame present. Loose or damaged electrical circuit for the valve inside the valve box (SERV PRO). This may also show as Code 1.
Code 5 — Flame at Start Up
Unwanted pilot flame at start-up when there should be NO flame. Control module or gas valve malfunction (SERV PRO). Do not attempt to run the unit — shut gas off at the supply valve.
Code 6 — Igniter Open
Igniter shows no glow when it should (normal glow ~10 seconds on start). Igniter damaged or disconnected — re-connect the plug to the valve box, or replace the igniter assembly (SERV PRO).
Code 7 — Broken Communication Cable (HI/LO only)
No response from smart device or remote. The communication cable between the module and the transceiver is disconnected or damaged inside the valve box (SERV PRO — inspect and repair).
Code 8 — Smart Device/Remote Not Paired (HI/LO only)
Same symptom as Code 7 but the fix is re-pairing instead of hardware. Power-cycle the unit (unplug, wait 10 sec, re-plug). Hold POWER and LOW on the remote at the same time until the remote LED flashes continuously. On successful pair you get 2 extra confirmation flashes.
Code 9 — Out of Range (HI/LO only)
Unit has power but remote or app won't communicate. Move closer, ensure direct line of sight to the antenna. HPC's RF range is approximate 30-50 ft depending on enclosure material (metal enclosures attenuate signal).
Code 10 — Internal Control Fault or Over Temperature
No power at all? Check the breaker and the wall switch. Weak remote? Replace batteries. Won't cycle? Check the external fuse. Still nothing? The module may be receiving wrong voltage from the transformer (SERV PRO — replace both). Communicates via remote but not the app? Re-sync the app (close + reopen + re-pair).

Common mistakes

Trying to fix a Code 2 by scraping more vents open with a blade. Scraped-open vents often have carbon or spider nests behind them. Pull the lava rock first and inspect the burner chamber — if there's unexpected combustion residue, you've got a gas leak upstream, not a vent problem.
Changing remote batteries on every Code 10. Code 10 is a catchall for module, voltage, or transformer faults — not just battery. If fresh batteries don't clear it, call SERV PRO.

Hands-on tips

Clean the flame-sensor tip with a soft brush every season — Code 1 from soot buildup is the single most common HPC EI fault.
Keep your remote battery fresh (CR2032 or AAA depending on remote vintage). Dead remote mimics Code 9 or 10.
Photograph your valve box wiring BEFORE a SERV PRO visit — if a connection gets changed, you have the baseline.

Questions people ask

My app says Error Log is empty but the pit won't light.

Power-cycle the unit (unplug power, wait 10 seconds, re-plug) and retry. The module may have cleared an older code; the next light attempt will produce a current one.

How many LED flashes = Code 10?

Ten. The flash count corresponds directly to the code number: Code 1 = 1 flash, Code 10 = 10 flashes, with a pause between repeats.

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HPC Electronic Ignition Error Codes 1-10: What Each One Means

By Ash · Updated November 10, 2026

Editorial review · November 10, 2026

Step by step

Code 1 — Ignition Failure

Symptoms: weak or no pilot flame, cold flame sensor. Confirm gas is connected and the shutoff is FULLY ON. If pressure is fine, the flame-sensor tip isn't 3/8" in the flame (SERV PRO), pilot orifice may be clogged (SERV PRO), or sensor copper tubing is kinked (SERV PRO — replace). If you see igniter glow but no flame, the valve box may have a loose or damaged electrical circuit (SERV PRO).

Code 2 — Over Temperature

The internal module cavity is running too hot. First check: is the enclosure vented per the install instructions? Clogged vents is #1 cause. If venting is good, look for unwanted fire in the enclosure cavity — a gas leak or air-mixer back-pressure (LP) can cause combustion inside the enclosure itself (SERV PRO, hard shutdown). Also: too much lava rock or glass on the burner can cause heat spikes. Reapply using HPC standard lava rock (#657) as a base coat, with larger lava or glass only as a top coat.

Code 3 — Thermocouple Error

Flame-sensor hardware fault. Connection loose at valve box (SERV PRO — re-tighten) or sensor copper tubing kinked or broken (SERV PRO — replace). Normal sensor voltage to module is 8-15 mV; outside that = the fault.

Code 4 — Hardware Fault

No pilot flame, no main flame — valve is clicking open but no flame present. Loose or damaged electrical circuit for the valve inside the valve box (SERV PRO). This may also show as Code 1.

Code 5 — Flame at Start Up

Unwanted pilot flame at start-up when there should be NO flame. Control module or gas valve malfunction (SERV PRO). Do not attempt to run the unit — shut gas off at the supply valve.

Code 6 — Igniter Open

Igniter shows no glow when it should (normal glow ~10 seconds on start). Igniter damaged or disconnected — re-connect the plug to the valve box, or replace the igniter assembly (SERV PRO).

Code 7 — Broken Communication Cable (HI/LO only)

No response from smart device or remote. The communication cable between the module and the transceiver is disconnected or damaged inside the valve box (SERV PRO — inspect and repair).

Code 8 — Smart Device/Remote Not Paired (HI/LO only)

Same symptom as Code 7 but the fix is re-pairing instead of hardware. Power-cycle the unit (unplug, wait 10 sec, re-plug). Hold POWER and LOW on the remote at the same time until the remote LED flashes continuously. On successful pair you get 2 extra confirmation flashes.

Code 9 — Out of Range (HI/LO only)

Unit has power but remote or app won't communicate. Move closer, ensure direct line of sight to the antenna. HPC's RF range is approximate 30-50 ft depending on enclosure material (metal enclosures attenuate signal).

Code 10 — Internal Control Fault or Over Temperature

No power at all? Check the breaker and the wall switch. Weak remote? Replace batteries. Won't cycle? Check the external fuse. Still nothing? The module may be receiving wrong voltage from the transformer (SERV PRO — replace both). Communicates via remote but not the app? Re-sync the app (close + reopen + re-pair).

Common mistakes

Trying to fix a Code 2 by scraping more vents open with a blade. Scraped-open vents often have carbon or spider nests behind them. Pull the lava rock first and inspect the burner chamber — if there's unexpected combustion residue, you've got a gas leak upstream, not a vent problem.

Changing remote batteries on every Code 10. Code 10 is a catchall for module, voltage, or transformer faults — not just battery. If fresh batteries don't clear it, call SERV PRO.