E-11 and E-12 on newer diesel heater controllers

Which heaters show E-11 and E-12?

The common fault table ends at E-10. The B2010 controller is the one documented panel that keeps the same ten meanings and adds two more. Manual You can recognise it by the spanner symbol on its setting button and by gears shown as P-01 in manual mode; see the B2010 page.

If your screen shows E11 or E12 with no dash, on an LCD switch you turn and press, you have a different controller and a different table. That is covered further down.

What does E-11 mean on the B2010?

The ambient temperature sensor is open circuit or short-circuited. Manual This is not the case sensor on the heater body: a case sensor fault is E-09 on this controller.

The manual prints the meaning and nothing else: no remedy, no test value and no location for the sensor. Manual What it does give you is a way to look at the reading. In standby, the confirm button steps through the clock, the ambient temperature, the supply voltage, the gear or temperature setting, the shell temperature and the failure code. Manual

Checks, in order:

1. Step to the ambient temperature in the standby display. If the figure is plausible for the room, the fault may be intermittent: note when the code appears.
2. With the power off, check the cable and plugs between the control panel and the heater for damage and for a plug that is not fully home. The manual does not say where the ambient sensor is fitted, so this is a general wiring check, not a targeted one.
3. Try manual mode. The B2010 switches between manual gears and constant temperature when you hold up and down together; a flashing temperature means thermostat mode and P-01 means manual gears. Manual The manual does not say whether the heater will run in manual mode with E-11 present.

If the code stays, the manual offers nothing further: contact the seller about a replacement panel or control unit. There are no owner reports of E-11 on a B2010 in the research data, so there is no confirmed field fix to pass on.

What does E-12 mean on the B2010?

Controller overheating: the controller temperature has gone above 100 °C (212 °F). Manual The manual’s remedy is one line: check whether the air inlet and outlet are blocked, or whether the control unit is damaged. Manual

1. Let the heater cool completely.
2. Check the cabin air inlet. Nothing should sit against it, and an inlet duct should not be crushed or packed with dust.
3. Check the hot air outlet and any ducting for kinks, closed vents and blockages.
4. Restart and step to the shell temperature in the standby display while it runs. On this controller a shell above 260 °C raises E-05, a separate code. Manual

If E-12 comes back with free airflow on both sides, the manual’s second cause applies: a damaged control unit.

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

The pattern of a heater that runs and then shuts down hot is covered in shuts down or will not reach full power and on the E-05 page.

What do E11 and E12 with no dash mean on a Heatport or T4?

Something else entirely. On the rotary-switch LCD on Heatport H2 and H4 heaters (one rotary switch) and the generic T4 (two knobs), codes have no dash:

Both rows are from those two manuals. Manual So E12 on that switch sends you to the glow plug connection, not to airflow. The whole table is on E1, E2, E3 with no dash.

Other brands may use these numbers too. A search excerpt of one owner’s post mentions false E11 errors on an Hcalory Toolbox Max, which the poster blamed on a radio transmitter in the same room. Owners The thread was not read in full and no manual for that panel is in the sources used here, so the meaning of E11 there is not documented.

How do I clear E-11 or E-12?

Deal with the cause, let the heater cool, then reset it as described in how to reset a locked-out heater. The B2010 manual does not describe a separate procedure for clearing these two codes.