E1, E2, E3 (no dash): rotary-switch LCD codes

Is my code E1 or E-01? Check the screen first

Owners often type codes loosely: “E1” for E-01, “E 8” for E-08. In the Reddit threads collected for this site, no thread clearly concerned this family; titles with “E3” or “E-8” turned out to be common-table codes written short. Owners So before using this page, look at the controller itself:

• A wired LCD switch that you turn and press, plus a wireless remote. Heatport’s EnControl has one rotary switch. The T4 has two knobs, one for time and one for mode and power. Manual
• Codes with no dash: E0 to E14 in the Heatport manual, E0 to E15 in the T4 manual. Manual
• The screen shows Polr when you start fuel priming and 433 when the remote pairs. Manual

If you see a dash and two digits (E-01, E-08), go to the error code index. If you see a bare digit with no E on a Vevor knob LCD, go to the Vevor CY knob page: those panels use other tables again.

Two owner reports show how unreliable short codes are across unidentified units. One portable heater showed “E-1” as low voltage, cured with better cables. One heater with a remote showed E3 as failed ignition; it cleared after a charged battery on thick cables, a cleaned glow plug and screen and a bled fuel line, so the single cause is not isolated. Owners Neither matches the table on this page, so those units carry some other controller.

What do E1, E2 and E3 mean on a Heatport or T4?

E1: failed ignition. The T4 manual says the heater tried twice and failed to form a flame. Manual Heatport’s manual says that if the pump stops ticking and the display shows OFF with E1, fuel did not reach the heater: use the fuel pumping mode or repeat the start-up. Manual Its cause list starts with an empty tank or a fuel level below the suction pipe, then air locks from badly placed fuel lines, filter or pump, a blocked or squashed air intake or exhaust, water in those pipes, a blocked fuel line or filter and bad fuel, and ends with carbon in the burner, a dirty atomising screen or glow plug, the fuel pump and the control unit. Manual

E2: flame extinction. Heatport says to run the same checks as for E1. Manual The T4 manual defines it as the flame going out three times in a row, and lists bubbles in the fuel line, a pump with insufficient output, and carbon in the air intake and exhaust. Manual

E3: undervoltage or overvoltage. Only Heatport prints limits: a minimum of 10.5 V and a maximum of 15 V on the 12 V version, 22.5 V and 30 V on the 24 V version. It says to measure at the harness terminals, to charge first if the battery reads below 12.6 V (flooded) or 12.8 V (AGM), and names a charger in boost mode, an alternator or a solar controller as overvoltage causes. Manual The T4 manual gives no figures: it asks you to check the power cable installation and that any power converter supplies enough current and a stable output. Manual

For E1 and E2, Heatport’s list runs in this order: fuel level, fuel reaching the heater, air intake and exhaust clear, then the atomising screen and glow plug. For E3, measure where Heatport says to, at the harness terminals, not only at the battery. Manual

What about the rest of the codes?

The automatic table above gives every row. By group:

• Control electronics: E0 is a control unit fault. The T4 adds E15 and the control switch codes C2, C4 and C7. Manual
• Leftover fuel: E4, premature ignition, means fuel was left in the heater after an incomplete shutdown. Manual
• Temperature sensing: E6, E10 (overheat), E11 and E14 (sensor not positioned correctly). Manual Never bypass a sensor to clear these.
• Fuel pump: E7. Blower motor: E8. Manual
• Glow plug: E9 for a faulty plug or shorted wiring, E12 for a disconnected plug. Manual

Where do the Heatport and T4 manuals differ?

Point	Heatport H2/H4	T4
E5	Thermal efficiency failure	Not listed
E6	Sensor on the controller: replace the controller	Temperature sensor open or short circuit
E15, C2, C4, C7	Not listed	Listed

Both columns come from the manuals. Manual The procedures differ too:

Job	Heatport H2/H4	T4
Fuel priming	Heater shut down: press and hold the rotary switch until Polr shows, then release	Heater shut down: press the Time knob and the Power knob together until Polr shows and the buzzer sounds once
Remote pairing	Heater running in thermostatic mode: turn the rotary switch anticlockwise until Stu shows, press OFF on the remote, 433 shows	Heater shut down: hold the Time knob and the remote’s OFF button together until 433 shows

Both columns come from the manuals. Manual

On both, priming runs a fixed cycle by itself: about 500 rapid pump pulses (on the T4 after a wait of 80 seconds), and then the heater starts automatically. Manual Neither manual gives a way to stop the cycle part-way. Heatport warns that this mode is not for regular starts because it can flood the combustion chamber, and the T4 manual limits it to a first installation or an empty fuel circuit. Manual So use it only when the line is empty, never to chase a few bubbles. More on manual fuel priming and pairing the remote.

How do I clear the code, and when should I stop?

For E1, Heatport’s own answer is to repeat the start-up or use the fuel pumping mode until fuel arrives. Manual Heatport also says never to cut power while the heater is running or cooling, so wait for the shutdown to finish before disconnecting anything. Manual See how to reset a locked-out heater.

Both manuals end several rows with replacing the burner, the pump or the control unit. Carbon in the burner is beyond routine owner work.

If you are not sure, ask a technician. Opening the combustion chamber goes beyond routine owner maintenance. A mistake here can cause a fuel or exhaust leak. Stop if anything is unclear.