Rotary-switch LCD heater controller: E0 to E15 codes
Updated
Heatport's H2 and H4 EnControl manual (copyright LF Bros NZ) and a generic T4 heater manual share this table, and it is unrelated to the E-01 to E-10 table. Here E1 is failed ignition, E2 is flame-out and E3 is a voltage fault. Reading these codes against the common table sends you to the wrong part.
Is this your controller?
Also called: EnControl, T4 controller, LF Bros style controller
A wired LCD switch operated by turning and pressing a knob, with a wireless remote. Heatport's EnControl has one rotary switch; the T4 has two knobs (one for time, one for mode and power). Codes have no dash: E1, E2, E3. Two strings identify it: the screen shows Polr when you start fuel priming and 433 when you pair the remote.
How it shows a fault: E0 to E15 on the LCD, without a dash. The T4 manual adds C2, C4 and C7 for control-switch faults.
Reported on: Heatport H2 / H4 (EnControl), T4 (generic).
Not a match? See the other controller families.
At a glance
| Fault display | E1, E2, E3 … with no dash, on an LCD switch you turn and press |
|---|---|
| Codes documented | E0, E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E14, E15, C4, C2/C7 |
| Settings menu | Not documented in our sources |
| Remote pairing | T4: hold the Time knob and the remote's OFF button until 433 shows. Heatport: turn the switch anticlockwise to Stu, then press OFF on the remote |
Error codes on this controller
| Code | Controller | Manual or brand | Meaning | Stated limit |
|---|---|---|---|---|
| C2/C7 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Control switch Manual's remedy: Verify the control switch is properly connected to its wiring; replace the control switch if necessary. | Not stated |
| C4 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Control switch Manual's remedy: Replace the control switch. | Not stated |
| E0 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Control unit: fault of the ECU, or incorrect ECU / wired controller Manual's remedy: Replace ECU / wired controller. | Not stated |
| E0 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Control unit error Manual's remedy: Replace the control circuit board. | Not stated |
| E1 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Failed ignition Manual's remedy: No fuel entering the heater (tank empty or level below the suction pipe): fill and use fuel pumping mode or repeat start-up until bubbles are gone; wrong placement of fuel lines/filter/pump (airlock on intake side); wrong fuel line diameter; blocked or compressed air intake/exhaust; water in intake/exhaust pipe; blocked fuel line or filter; bad fuel; carbon in burner (replace burner); carbon in heat exchanger/exhaust/silencer (pressure clean with water); dirty atomising net or glow plug (replace); faulty gaskets; fuel pump; ECU. | Not stated |
| E1 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Failed to start (tried twice) / failed to form a flame Manual's remedy: Check for fuel exhaustion; remove bubbles in the fuel line and check supply; replace the pump if it fails to pump; clear blockages in air inlet or exhaust outlet; if white/black smoke, unplug the fuel inlet pipe, let the heater dry-run and restart. | Two start attempts |
| E2 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Flame extinction Manual's remedy: Same checks as E1. | Not stated |
| E2 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Flame off (repeated 3 times) Manual's remedy: Remove bubbles from the fuel line; replace the pump if output is insufficient; check and clean air intake and exhaust of carbon deposits. | Flame-out repeated 3 times |
| E3 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Undervoltage or overvoltage Manual's remedy: Verify battery voltage at the harness terminals (or at the ECU connector if the harness was extended); if below 12.6 V (flooded) / 12.8 V (AGM) charge the batteries first; overvoltage causes: charger in boost mode, alternator overcharging, solar controller overcharging; check ECU connector for dirt/corrosion; inspect harness; ECU. | Minimum 10.5 V (22.5 V for 24 V unit); maximum 15 V for 12 V version and 30 V for 24 V version |
| E3 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Undervoltage or overvoltage Manual's remedy: Verify voltage matches the heater's requirements; check power cord installation and that no non-compliant cords are used; confirm the power converter gives adequate current and stable output. | Not stated |
| E4 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Premature ignition identification Manual's remedy: Residual fuel in the heater (shutdown not completed, e.g. voltage drop): leave the heater in a warm, well-vented place to evaporate the fuel. | Not stated |
| E4 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Premature ignition Manual's remedy: Restart the heater after verifying that the last improper shutdown left residual fuel causing premature ignition. | Not stated |
| E5 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Thermal efficiency failure Manual's remedy: Bad fuel - replace; fuel filter blocked - clean/replace; fuel inlet blocked - clean inlet and tank; carbon in burner - replace burner; temperature sensor fault - replace the Pt1000 sensor; fuel pump fault - replace. | Not stated |
| E6 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Temperature sensor (on the controller) damaged Manual's remedy: Replace the controller. | Not stated |
| E6 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Open/short circuit of temperature sensor Manual's remedy: Verify sufficient installation space to avoid overheating; replace the temperature sensor or the circuit board if damaged. | Not stated |
| E7 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Fuel pump Manual's remedy: Check fuel pump / ECU connectors for dirt or corrosion; wiring harness; fuel pump; ECU. | Not stated |
| E7 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Open/short circuit of fuel pump Manual's remedy: Verify contact between harness and pump socket; replace the pump if necessary; replace the control board (rare). | Not stated |
| E8 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Blower motor Manual's remedy: Check heating air intake for obstructions and that the blower turns freely; impeller damage (obstruction, over-torqued ducting clamp, debris under the heater) - replace blower; short circuit - check resistance and wiring; loose ECU casing / mispositioned magnetic sensor - fix ECU position; ECU. | Speed failure: motor speed off specification by more than 10% for longer than 30 seconds |
| E8 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Motor Manual's remedy: Fix/reinstall the fan blade if stuck; replace the motor if defective; check the Hall sensor or circuit board; ensure motor wires are connected to the board socket. | Not stated |
| E9 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Glow plug (short circuit of wiring / faulty plug) Manual's remedy: Replace the glow plug; ECU. | Not stated |
| E9 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Glow plug failure Manual's remedy: Replace the glow plug; check for unstable voltage (power connections, fuse, battery voltage); replace the circuit board (rare); check glow plug wire connection to the board. | Not stated |
| E10 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Overheat: excess temperature measured at the overheat sensor Manual's remedy: Check fan not blocked/damaged; check ducting free from obstruction; remove the PT1000 sensor, check connections/wiring and reinstall; replace sensor if wiring damaged; ECU. | Not stated |
| E10 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Overheat Manual's remedy: Verify the air duct is not blocked; address temperature sensor failure or loose contact with the aluminium heat exchanger ('radiator'). | Not stated |
| E11 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | PT1000 temperature sensor connection malfunction / damaged / shorted Manual's remedy: Check PT1000 connection to ECU; replace the sensor; ECU. | Not stated |
| E11 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Open/short circuit of temperature sensor Manual's remedy: Replace the temperature sensor if damaged; ensure wires are properly connected to the sensor and circuit board ports. | Not stated |
| E12 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | Glow plug disconnected Manual's remedy: Connect the glow plug to the ECU; glow plug; ECU. | Not stated |
| E12 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Open circuit of glow plug Manual's remedy: Check power connections, fuse and battery voltage; replace the circuit board if necessary. | Not stated |
| E14 | Rotary-switch LCD, E0 … E15 | Heatport H2 / H4 (EnControl) Manual | PT1000 temperature sensor not positioned correctly Manual's remedy: Install the PT1000 temperature sensor correctly. | Not stated |
| E14 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Incorrect location of temperature sensor Manual's remedy: Install the temperature sensor properly. | Not stated |
| E15 | Rotary-switch LCD, E0 … E15 | T4 two-knob LCD switch Manual | Open circuit of 'Setvalue Generator' Manual's remedy: Replace the control circuit board. | Not stated |
Procedures on this controller
Prime the fuel line Manual
T4: with the heater shut down, press the Time knob and the Power knob together until Polr shows and the buzzer sounds once, then release. Heatport: with the heater shut down, press and hold the rotary switch until Polr shows, then release. On both, the pump then runs a fixed rapid priming cycle by itself; the Heatport manual says the heater starts automatically afterwards and that this mode is not for regular starts.
The manuals describe no way to stop this cycle part-way, so use it only when the line is empty (new installation or after running dry).
Pair the remote Manual
T4: with the heater shut down, press and hold the Time knob on the switch and the OFF button on the remote at the same time; the screen shows 433 and the buzzer sounds once. Heatport: with the heater running in thermostatic mode, keep turning the rotary switch anticlockwise until the screen shows Stu, then press OFF on the remote; 433 shows when paired.
Known quirks
- Heatport's manual gives the voltage limits for E3 as a minimum of 10.5 V and a maximum of 15 V on the 12 V version.
- E4 (premature ignition) points to fuel left in the burner after an incomplete shutdown.
Pages that apply to this controller
- E1, E2, E3 with no dash
- Reset a locked-out heater
- White smoke and no start
- Shuts down or low power
- Controller screen is blank
- Altitude tuning
- Hidden settings menu
- Soot build-up and the clean burn
- Manual fuel priming
- Pairing the remote
- Lithium, power stations and voltage errors
- Cleaning the glow plug and its screen
- All error codes in one table
Sources
Everything on this page is compiled from the documents and discussions below. We summarise them in our own words; follow the links for the originals.
- Heatport H2 / H4 EnControl user manual v1.00 (PDF) (cdn.shopify.com)
- T4 diesel air heater user manual, Alza import (PDF) (dwn.alza.cz)