Toshiba 01 fault code
Toshiba air conditioning
What it means
OPERATION + TIMER (White) flashing 5 Hz: connecting cable / serial signal
Stage-one block code. Toshiba: "Protective circuit operation for connecting cable and serial signal system" — the indoor and outdoor units are not talking, or the interconnect is at fault.
UK models this code applies to
From the Toshiba service literature we hold (Toshiba service manual SVM-19001-3 (Seiya) / SVM-18009 (Shorai P) §11-3, Table 11-3-1 (flashing-LED block codes)) — not a scraped list.
Seiya RAS-B05S4KVG-E / RAS-05E2AVG-ESeiya RAS-B07S4KVG-E / RAS-07E2AVG-ESeiya RAS-B10S4KVG-E / RAS-10E2AVG-ESeiya RAS-B13S4KVG-E / RAS-13E2AVG-ESeiya RAS-B16S4KVG-E / RAS-16E2AVG-ESeiya RAS-B18S4KVG-E / RAS-18E2AVG-ESeiya RAS-B24S4KVG-E / RAS-24E2AVG-EShorai Curve RAS-B10P2KVSG(B)-E / RAS-10J2AVSG-E1Shorai Edge RAS-B13P2KVSG(B)-E / RAS-13J2AVSG-E1Shorai Edge RAS-B16P2KVSG(B)-E / RAS-16J2AVSG-E1Shorai Edge RAS-B18P2KVSG(B)-E / RAS-18J2AVSG-E1Shorai Edge RAS-B22P2KVSG(B)-E / RAS-22J2AVSG-E1Shorai Edge RAS-B24P2KVSG(B)-E / RAS-24J2AVSG-E1Haori RAS-B10N4KVRG-E1 / RAS-10J2AVSG-E1Haori RAS-B13N4KVRG-E / RAS-13J2AVSG-E1Haori RAS-B16N4KVRG-E / RAS-16J2AVSG-E1Daiseikai 10 RAS-B10S4KVPG-E / RAS-10S4AVPG-EDaiseikai 10 RAS-B13S4KVPG-E / RAS-13S4AVPG-EDaiseikai 10 RAS-B18S4KVPG-E / RAS-18S4AVPG-ESeiya RAS-B10J2KVG-E / RAS-10J2AVG-ESeiya RAS-B13J2KVG-E / RAS-13J2AVG-ESeiya RAS-B16J2KVG-E / RAS-16J2AVG-ESeiya RAS-B24J2KVG-E / RAS-24J2AVG-EShorai Edge RAS-B10J2KVSG-E / RAS-10J2AVSG-EShorai Edge RAS-B13J2KVSG-E / RAS-13J2AVSG-EShorai Edge RAS-B16J2KVSG-E / RAS-16J2AVSG-EShorai Edge RAS-B18J2KVSG-E / RAS-18J2AVSG-EShorai Edge RAS-B24J2KVSG-E / RAS-24J2AVSG-ERAS R410A wall splits RAS-07BAV-ERAS R410A wall splits RAS-10BAV-ERAS R410A wall splits RAS-13BAV-ERAS R410A wall splits RAS-16BAV-ERAS R410A wall splits RAS-107SAV-E6RAS R410A wall splits RAS-137SAV-E6RAS R410A wall splits RAS-167SAV-E5RAS R410A wall splits RAS-10N3AVP-ERAS R410A wall splits RAS-13N3AVP-ERAS R410A wall splits RAS-16N3AVP-ERAS R410A wall splits RAS-10G2AVP-ERAS R410A wall splits RAS-13G2AVP-ERAS R410A wall splits RAS-16G2AVP-ERAS R410A wall splits RAS-10N3AV2-E1RAS R410A wall splits RAS-13N3AV2-E1RAS R410A wall splits RAS-16N3AV2-ERAS R410A wall splits RAS-18N3AV2-ERAS R410A multi-split outdoor RAS-2M14S3AV-ERAS R410A multi-split outdoor RAS-2M18S3AV-ERAS R410A multi-split outdoor RAS-3M18S3AV-ERAS R410A multi-split outdoor RAS-3M26S3AV-ERAS R410A multi-split outdoor RAS-4M27S3AV-ERAS R410A multi-split outdoor RAS-5M34S3AV-ERAS R32 multi RAS-2M10U2AVG-ERAS R32 multi RAS-2M14U2AVG-ERAS R32 multi RAS-2M18U2AVG-ERAS R32 multi RAS-3M18U2AVG-ERAS R32 multi RAS-3M26U2AVG-ERAS R32 multi RAS-4M27U2AVG-ERAS R32 multi RAS-5M34U2AVG-E
Now the harder half: proving what caused it
01 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.
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