European-range Hobart fryer thermostats: RTCU700609 electronic control thermostat (105–185 °C, ⌀6 mm × 130 mm probe, 900 mm capillary) and RTBF800164 limit thermostat (225 °C cut-out, 3-pole, M10×1 fitting). Both fit HEF47, HEF77, BCESF and BMESF fryers.
This item is listed under the following part numbers across manufacturer documentation and distributor catalogs:
RTCU700609MRTCU700609HOBRTCU700609RTCU7006EGO 5519032831EGO 55.19032.831EGO 5102918250MBM29151029182503206570037585693238RTBF800164MRTBF800164HOBRTBF800164M173501| RTCU700609 function | Electronic control thermostat |
|---|---|
| RTCU700609 temperature range | 105–185 °C (max 187 °C) |
| RTCU700609 poles | Single pole, 16 A |
| RTCU700609 probe | ⌀6 mm × 130 mm, capillary 900 mm |
| RTBF800164 function | Limit (safety) thermostat |
| RTBF800164 cut-out | 225 °C |
| RTBF800164 poles | 3-pole, function 3NC, 20 A |
| RTBF800164 probe | ⌀6 mm × 94 mm, capillary 900 mm |
| RTBF800164 fitting | M10 × 1 union nut, stainless steel probe |
| OEM naming | Hobart spare-parts diagram: “Thermostat electronic” (RTCU700609, item 31) and “Limit thermostat” (RTBF800164, item 32) |
These are the points that most often cause a wrong order on this specific part number. They are not generic advice.
Compiled from manufacturer catalog strings and distributor listings. Verify against your own equipment's parts manual before ordering. This is not an offer or a quotation.
The RTBF side is documented by a UK spare-parts listing. The RTCU number appears in no accessible public page, so this record states that gap rather than filling it.
| Source | Wording (verbatim) | What it is | Link |
|---|---|---|---|
| Cater Spares UK listing (distributor wording, not OEM) | “HOBART RTBF800164 ELECTRIC CHIPS FRYER SAFETY HIGH LIMIT CUT OFF THERMOSTAT 225c” | Safety high-limit function and a 225 C cut-out. Other UK listings quote 232 C for the same number — check the marking on the part. | catersparesuk.co.uk |
Control and limit thermostats for the European Hobart electric fryer range (HEF47/HEF77 and the BCEDF/BCESF/BMEDF/BMESF models). Note that these use a different numbering system from the US 00-xxxxxx-xxxxx parts: family numbers start with RTCU / RTBF, and some retail channels prefix them with M.
This page covers two separate devices that work together on the same fryer: an electronic control thermostat (RTCU700609) that cycles the element, and a limit thermostat (RTBF800164) that latches the circuit off at its cut-out. They are not interchangeable, they do not share a set point, and a fault in one mimics a fault in the other. Identify which device is open or calling before ordering either.
| Symptom | This part? | Check first |
|---|---|---|
| No heat, controller display normal | Possible — control thermostat open, or limit latched | Limit thermostat continuity first; then the control thermostat's contacts |
| Oil overshoots the set point | Possible — control thermostat contacts welded | Limit thermostat still intact? If it never opens the family is unprotected |
| Dead after an overheat event | Yes — limit thermostat latched | Cool down, then measure the limit device; find out why it opened before resetting |
| Temperature reads plausibly but control is erratic | Possible — probe or capillary damaged | Probe seating, capillary routing, connector condition |
Hobart BCEDF, BCESF, BMEDF, BMESF, HEF47, HEF472V, HEF472VT, HEF47T, HEF77 and HEF77T electric fryers.
RTCU700609 is the electronic control thermostat (105–185 °C range); RTBF800164 is the limit/safety thermostat that cuts out at 225 °C.
Some distributors list M173501 as a replacement for HEF47 fryers. We have not been able to confirm the exact technical equivalent, and the specifications of M173501 are not published in the sources we checked.
No — these are European-range Hobart part numbers with their own numbering system.
Capillary, millivolt and high-limit thermostats in these part families are produced in volume in China. Public supplier directories list manufacturers concentrated in specific industrial clusters: Zhongshan (Guangdong) for capillary, millivolt and deep-fryer thermostats; Wenzhou (Zhejiang) for capillary, gas, immersion and mechanical thermostats with OEM/ODM capability; and Jinan (Shandong) for gas-valve and thermostatic gas-control components. When sourcing these parts from China, verify: dimensional drawings, sensing-bulb and capillary specifications, temperature accuracy, electrical ratings, cycle-life testing and applicable safety certifications (CE / CQC / UL). A high-limit safety thermostat must not be substituted on the basis of physical fit alone.
Compiled from Hobart official spare-parts diagrams (BCESF/BMESF drawings, items 31 and 32), Parts Town UK, CaterSpares UK and Gastroparts parts schemes.
Part numbers and specifications are reproduced as published by the sources listed above. This page is a reference compilation for identification purposes. Last compiled: 2026-10-31.