diff --git a/backend/documents_parser/tests/test_pashub_sap_accuracy_wythenshawe.py b/backend/documents_parser/tests/test_pashub_sap_accuracy_wythenshawe.py
index eef150c8a..f070a04cb 100644
--- a/backend/documents_parser/tests/test_pashub_sap_accuracy_wythenshawe.py
+++ b/backend/documents_parser/tests/test_pashub_sap_accuracy_wythenshawe.py
@@ -46,8 +46,13 @@ _MANIFEST_PATH = _FIXTURES_DIR / "manifest.json"
 # headroom; treat them as a regression tripwire, NOT a cohort accuracy figure,
 # and re-baseline (coverage growth is not loosening) as further mapper fixes
 # unblock fixtures.
+# 2026-07-16 (#1622/#1624): room-heater control 2601 unblocked the two 'No
+# thermostatic control...' fixtures → **151 computed / 17 blocked** (within-0.5
+# 76.2% = 115/151, MAE 0.716; 500767954156 lands within 0.5, 500797465814 is a
+# −8.8 tail entry). MAE ceiling re-baselined 0.67 → 0.72 per the
+# coverage-growth convention above.
 _MIN_WITHIN_HALF: float = 0.76
-_MAX_SAP_MAE: float = 0.67
+_MAX_SAP_MAE: float = 0.72
 
 _KNOWN_GAP_REASON = (
     "pashub `from_site_notes` mapper does not int-code a main-heating "
diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 139f31bd3..78d11ac71 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -8037,8 +8037,11 @@ _PASHUB_STORAGE_HEATER_CONTROL_TO_SAP10: Dict[str, int] = {
 # PasHub surveyed room-heater control labels → their SAP 10.2 Table 4e Group 6
 # code (spec PDF p.173). PasHub lodges the singular "Programmer and room
 # thermostat"; Table 4e's Group 6 wording is the plural "Programmer and room
-# thermostats" (2605) — same control.
+# thermostats" (2605) — same control. 2601 is the lowest-control (manual /
+# no-thermostat) Group 6 code: control type 2, +0.3 °C MIT adjustment (PCDB
+# `room_heater_systems_controls`), one step below 2602.
 _PASHUB_ROOM_HEATER_CONTROL_TO_SAP10: Dict[str, int] = {
+    "No thermostatic control of room temperature": 2601,
     "Appliance thermostats": 2602,
     "Programmer and room thermostat": 2605,
 }