diff --git a/backend/documents_parser/tests/test_heating_systems_corpus.py b/backend/documents_parser/tests/test_heating_systems_corpus.py
index 82a28ed6..20628972 100644
--- a/backend/documents_parser/tests/test_heating_systems_corpus.py
+++ b/backend/documents_parser/tests/test_heating_systems_corpus.py
@@ -608,11 +608,28 @@ _EXPECTATIONS: tuple[_CorpusExpectation, ...] = (
     # offset the §7 MIT over-count, masking the bug. Per
     # [[feedback-software-no-special-handling]] apply spec-correct fix
     # uniformly; the exposed §7 MIT residual is the next closure front.
-    _CorpusExpectation(variant='community heating 1', block='11b', expected_sap_resid=-1.0572, expected_cost_resid_gbp=+24.3605, expected_co2_resid_kg=+127.2164, expected_pe_resid_kwh=+408.6704),
-    _CorpusExpectation(variant='community heating 2', block='11b', expected_sap_resid=-0.4187, expected_cost_resid_gbp=+9.6470, expected_co2_resid_kg=-1356.9498, expected_pe_resid_kwh=+1778.5550),
-    _CorpusExpectation(variant='community heating 3', block='11b', expected_sap_resid=-1.0572, expected_cost_resid_gbp=+24.3605, expected_co2_resid_kg=-72.8776, expected_pe_resid_kwh=-239.0266),
-    _CorpusExpectation(variant='community heating 4', block='11b', expected_sap_resid=-0.4187, expected_cost_resid_gbp=+9.6470, expected_co2_resid_kg=-4323.7080, expected_pe_resid_kwh=+767.1285),
-    _CorpusExpectation(variant='community heating 6', block='11b', expected_sap_resid=-8.4406, expected_cost_resid_gbp=+194.4846, expected_co2_resid_kg=-2861.5307, expected_pe_resid_kwh=+8137.1145),
+    #
+    # Slice S0380.175 wired the §14.1 Community Heating "Heating Controls
+    # SAP" lodging (bare 4-digit form like "2306") into the
+    # `main_heating_control` field on the mapper-produced Main 1. Pre-
+    # slice the mapper only read §14.0 Main Heating "Main Heating
+    # Controls Sap" which is empty for community heating certs; the
+    # cascade defaulted to control_type=2, mis-routing the §7 elsewhere-
+    # zone off-hours to (7, 8) when SAP code 2306 ("Charging system
+    # linked to use of heating, programmer and TRVs") dispatches via
+    # Table 4e Group 3 to control_type=3 / off-hours (9, 8). The fix
+    # closes CH1 and CH3 SAP / cost EXACTLY; CH2/CH4 cost flip from
+    # +£9.65 to -£12.16 (CHP-split blend now sees lower SH kWh × CHP
+    # rate); CH6 SAP narrows -8.44 → -7.49. Remaining CH1/CH3 CO2/PE
+    # residuals are the §13a (372) "Electrical energy for heat
+    # distribution" line — 118.38 kWh billed at electricity factors
+    # (CO2 0.1993, PE 1.760), not heat-network factors — the cascade
+    # doesn't currently meter this. Next follow-up slice.
+    _CorpusExpectation(variant='community heating 1', block='11b', expected_sap_resid=+0.0000, expected_cost_resid_gbp=-0.0000, expected_co2_resid_kg=-23.6007, expected_pe_resid_kwh=-208.2267),
+    _CorpusExpectation(variant='community heating 2', block='11b', expected_sap_resid=+0.5277, expected_cost_resid_gbp=-12.1598, expected_co2_resid_kg=-1435.0874, expected_pe_resid_kwh=+1123.0063),
+    _CorpusExpectation(variant='community heating 3', block='11b', expected_sap_resid=+0.0000, expected_cost_resid_gbp=-0.0000, expected_co2_resid_kg=-98.9235, expected_pe_resid_kwh=-457.5428),
+    _CorpusExpectation(variant='community heating 4', block='11b', expected_sap_resid=+0.5277, expected_cost_resid_gbp=-12.1598, expected_co2_resid_kg=-4401.8456, expected_pe_resid_kwh=+111.5798),
+    _CorpusExpectation(variant='community heating 6', block='11b', expected_sap_resid=-7.4942, expected_cost_resid_gbp=+172.6778, expected_co2_resid_kg=-2939.6683, expected_pe_resid_kwh=+7481.5658),
 )
 
 
@@ -945,6 +962,53 @@ def test_community_heating_mapper_populates_chp_split_fields(
     assert main_1.community_heating_boiler_fuel_type == expected_boiler_fuel_code
 
 
+# S0380.175 — Community heating main_heating_control extraction.
+#
+# Per SAP 10.2 Table 4e Group 3 (PDF p.173): heat-network control codes
+# 2301-2314 dispatch to control_type 1, 2, or 3. The cert lodges the
+# code in §14.1 Community Heating "Heating Controls SAP" rather than
+# §14.0 Main Heating's "Main Heating Controls Sap". Pre-slice the mapper
+# only read the §14.0 field, leaving `main_heating_control=''` and the
+# cascade defaulting to type 2 (modal RdSAP default). The §14.1 lodging
+# carries the actual control code, which feeds Table 9 elsewhere-zone
+# off-hours selection (type 1/2 → (7,8); type 3 → (9,8)) and the §7
+# T_h2 MIT cascade.
+@pytest.mark.parametrize(
+    ("variant", "expected_main_heating_control"),
+    (
+        # All 5 CH variants lodge "Heating Controls SAP: 2306" in §14.1
+        # Community Heating. SAP 10.2 Table 4e Group 3 row 2306 =
+        # "Charging system linked to use of heating, programmer and TRVs"
+        # → control_type 3, temperature_adjustment 0 °C.
+        ('community heating 1', 2306),
+        ('community heating 2', 2306),
+        ('community heating 3', 2306),
+        ('community heating 4', 2306),
+        ('community heating 6', 2306),
+    ),
+    ids=lambda v: v if isinstance(v, str) else str(v),
+)
+def test_community_heating_mapper_picks_up_section_14_1_heating_controls_sap(
+    variant: str, expected_main_heating_control: int,
+) -> None:
+    # Arrange — community heating Summary lodges the SAP control code in
+    # §14.1 Community Heating "Heating Controls SAP", NOT in §14.0 Main
+    # Heating "Main Heating Controls Sap" (which is empty for community
+    # heating certs). Mapper must read from the community block when the
+    # main block is empty.
+    summary_pdf, _ = _variant_paths(variant)
+    pages = _summary_pdf_to_textract_style_pages(summary_pdf)
+    site_notes = ElmhurstSiteNotesExtractor(pages).extract()
+
+    # Act
+    epc = EpcPropertyDataMapper.from_elmhurst_site_notes(site_notes)
+
+    # Assert — Main 1 picks up the §14.1 community heating control code.
+    main_heating_details = epc.sap_heating.main_heating_details
+    assert main_heating_details is not None and len(main_heating_details) >= 1
+    assert main_heating_details[0].main_heating_control == expected_main_heating_control
+
+
 # S0380.172 — Heat-network heat-source-eff scaling residual coverage.
 #
 # Per SAP 10.2 Table 4a (PDF p.164): "Boilers (RdSAP)" eff=80%, "Heat
diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index db35e1c2..7c6532a9 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -4042,11 +4042,27 @@ def _elmhurst_secondary_fuel_from_sap_code(
 
 
 def _elmhurst_sap_control_code(sap_control: str) -> Optional[int]:
-    """Extract the SAP code integer from a heating-controls field like
-    'SAP code 2106, Programmer, room thermostat and TRVs' → 2106. The
-    cascade reads `main_heating_control` as int when present."""
+    """Extract the SAP code integer from a heating-controls field.
+
+    Two lodgement forms across the Elmhurst Summary corpus:
+        1. '§14.0 Main Heating Controls Sap: SAP code 2106, Programmer,
+           room thermostat and TRVs' (individually-heated dwellings).
+        2. '§14.1 Community Heating Heating Controls SAP: 2306' — bare
+           4-digit integer string (community heating dwellings, per
+           SAP 10.2 Table 4e Group 3 codes 2301-2314).
+
+    Either form yields the cascade-readable int. Returns None when the
+    lodgement is empty or doesn't carry a recognisable code.
+    """
+    if not sap_control:
+        return None
     m = re.match(r"SAP code\s+(\d+)", sap_control)
-    return int(m.group(1)) if m else None
+    if m:
+        return int(m.group(1))
+    bare = sap_control.strip()
+    if bare.isdigit():
+        return int(bare)
+    return None
 
 
 # SAP10.2 Table 4a main-heating-category codes. The cascade reads
@@ -4697,7 +4713,15 @@ def _map_elmhurst_main_heating_2(
 
 def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
     mh = survey.main_heating
+    # Community heating dwellings lodge the SAP control code in §14.1
+    # Community Heating "Heating Controls SAP" (bare 4-digit form, e.g.
+    # "2306"), not in §14.0 Main Heating "Main Heating Controls Sap".
+    # Fall through to the §14.1 lodging when §14.0 is empty so the
+    # cascade reads `main_heating_control` as the lodged Table 4e Group 3
+    # code instead of defaulting to type 2.
     sap_control = mh.heating_controls_sap
+    if not sap_control and mh.community_heating is not None:
+        sap_control = mh.community_heating.heating_controls_sap
     control = (
         sap_control.split(", ", 1)[1]
         if sap_control.startswith("SAP code") and ", " in sap_control