What F1, F2 and F3 mean after E-03, E-04, E-06 and E-09

Which controller shows F1, F2 and F3?

The B2010. It looks like the classic black five-button panel, but its setting button carries a spanner symbol and in manual mode it shows gears such as P-01. Its fault list runs to E-12, and four of the codes come with an F suffix. Manual If your panel has no spanner button, see the controllers page to identify it; the details for this one are on the B2010 page.

The stored fault can be read in standby: the confirm button steps through the clock, ambient temperature, supply voltage, gear or temperature setting, shell temperature and then the failure code. Manual

What does each combination mean?

The E-code names the part. The F-code names the kind of fault.

Code	F1	F2	F3
E-03 glow plug	Short circuit	Open circuit	Abnormality
E-04 fuel pump	Short circuit	Open circuit	Not listed
E-06 fan motor	Short circuit	Open circuit	Hall sensor cannot read fan speed
E-09 case sensor	Short circuit	Open circuit	Not listed

All of these rows come from the B2010 manual. Manual The manual gives the meanings only: it prints no remedy for any of the sub-codes, and it does not explain what “abnormality” covers for the glow plug.

What is the difference between a short circuit and an open circuit?

An open circuit (F2) means the board sees no connection to the part. In practice that is a plug that has come off the board, a broken wire, or a part that has burnt out internally, such as a glow plug element.

A short circuit (F1) means current is taking a path it should not: two wires touching, a lead chafed through to the metal case, or a part that has failed internally.

The split tells you where to start. With F2, look for something disconnected. With F1, look for damaged insulation and pinched leads.

What should I check for each sub-code?

Work with the power off and the heater cool.

1. Write down both codes. E-06 F2 and E-06 F3 lead to different checks.
2. F2 on any of the four codes: find that part’s plug on the control board and check it is fully seated, then follow the lead for a break. If the plug and lead are sound, the part itself is the suspect: glow plug for E-03, dosing pump for E-04, fan motor for E-06, case temperature sensor for E-09.
3. F1 on any of the four codes: inspect the lead for chafing and for bare wire touching the case or another wire. If the wiring is sound, the part is the suspect.
4. E-06 F3: the board cannot read the fan speed. The B2010 manual does not say why. Two other manuals describe the mechanism: the Hcalory M98 lists a fan magnet too far from the Hall sensor on the main board, and OnTrack says a main board that has shifted no longer lines up with the fan magnets and should be removed and reseated. Manual
5. Codes that appeared straight after a rebuild: two owners report E-09, or E-06 and E-09 in turn, after reassembly because the fan plug and the temperature sensor plug are identical and had been swapped. Owners Check that first.

One owner reports F2 with E-06 after disturbing the fan impeller: the motor made half a turn and stalled, and the cause was brush dust packed into the motor’s commutator. Cleaning it cleared the code. Owners That is a single report, so treat it as a lead.

Never bridge or bypass the case temperature sensor to get rid of E-09. Repair the connection or replace the sensor.

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

Repair the fault, then reset the heater as described in how to reset a locked-out heater. The pages for E-03, E-04, E-06 and E-09 cover each part in more depth.

If the same sub-code returns with a new part fitted and sound wiring, the control board is the remaining suspect.

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.