diff --git a/goodwe_controller/DECISIONS/MAINT-24-charge-first.md b/goodwe_controller/DECISIONS/MAINT-24-charge-first.md
index 2aae299..8cdbe82 100644
--- a/goodwe_controller/DECISIONS/MAINT-24-charge-first.md
+++ b/goodwe_controller/DECISIONS/MAINT-24-charge-first.md
@@ -1,6 +1,6 @@
 # MAINT-24 - a started maintenance charge gets the cheap night
 
-**Status: for review.** Tests: `test_maint24.py`. No option added; the MAINT-13
+**Status: for review.** Tests: `test_maint24.py` (`test_opt20.py`'s `ch_ch_maint` digest moved with it). No option added; the MAINT-13
 timeout numbers are unchanged. Folds in SAFETY-80. SAFETY-111 stays on its card (section 3).
 
 **What happened (live 0.21.0, A, 2026-11-08..11).** A sat in its maintenance
@@ -18,7 +18,9 @@ charging time and ended the cycle. Report: `reports/MAINT-24-investigation-repor
 `modetrade.decide(maint_charging=)`, set in `_mode_roles()` when any pack is in
 its maintenance CHARGE phase. It is the mirror of `draining` (SAFETY-78): no
 grid-charge trade for the other packs, why `cycle`, the same Tick. The other
-packs keep their solar roles, so they may still take spare solar. B's night
+packs keep their solar roles, so they may still take spare solar. A refusal probe
+(SAFETY-73, PROBE_W alone, OPT-20) still goes on: it places no charge on the
+pack in maintenance, and `test_opt20.py` g7 pins it. The drain still blocks it. B's night
 charge waits for the nights A needs. At N=1 the only pack is the one in
 maintenance, so nothing changes.
 
diff --git a/goodwe_controller/app/modetrade.py b/goodwe_controller/app/modetrade.py
index 2c07891..75f6c58 100644
--- a/goodwe_controller/app/modetrade.py
+++ b/goodwe_controller/app/modetrade.py
@@ -199,7 +199,8 @@ def decide(runs, now, packs, *, charge_ok, sell_ok, trade_why, price_now,
     charge from the grid (why "cycle"). `wait` ("wait" or "settle", the
     why) says no charge may start yet (SAFETY-135). `maint_charging` says a
     battery is in its maintenance CHARGE phase: no grid charge for the others
-    either, same why (MAINT-24, DECISIONS/MAINT-24-charge-first.md).
+    either, same why, but a refusal probe goes on (MAINT-24,
+    DECISIONS/MAINT-24-charge-first.md).
     """
     plan_on = runs is not None and runs.on
     in_cheap = plan_on and runs.cheap.holds(now) and runs.charge_useful()
@@ -209,8 +210,12 @@ def decide(runs, now, packs, *, charge_ok, sell_ok, trade_why, price_now,
     why = None
     ch = chargers(packs, ceiling_pct, done_charge, targets, probe=True) \
         if in_cheap else []
-    if ch and (draining or maint_charging):
+    if ch and draining:
         ch, why = [], "cycle"
+    elif ch and maint_charging:
+        # MAINT-24: a refusal probe (PROBE_W alone, OPT-20) may go on.
+        ch = [p for p in ch if p.refused < 0]
+        why = None if ch else "cycle"
     charging = False
     if ch:
         need = 0.0 if charging_now else START_W
diff --git a/goodwe_controller/test_maint24.py b/goodwe_controller/test_maint24.py
index 95a3c73..0309fea 100644
--- a/goodwe_controller/test_maint24.py
+++ b/goodwe_controller/test_maint24.py
@@ -205,6 +205,17 @@ check("with it: no charge, why 'cycle', B keeps a hold role, no ask",
       _on.action is None and _on.why == "cycle" and _on.ask_w == 0.0
       and _on.roles[B] == modetrade.HOLD)
 check("same answer as the SAFETY-78 drain", _on == _dr)
+_pr = modetrade.Pack(B, True, packmode.CHEAP_HOURS, False, 2500.0, 30.0, 10.0,
+                     refused=-1, probing=True)
+_tp = _dec([_pa, _pr], maint_charging=True)
+check("a refusal probe beside the maintenance charge goes on: PROBE_W alone "
+      "(OPT-20); beside a drain it does not",
+      _tp.action == modetrade.CHARGE and _tp.ask_w == -modetrade.PROBE_W
+      and _dec([_pa, _pr], draining=True).action is None)
+check("a probe does not carry a normal charger along",
+      _dec([_pa, _pr, modetrade.Pack("inverter-c", True, packmode.CHEAP_HOURS,
+                                     False, 2500.0, 30.0, 10.0)],
+           maint_charging=True).ask_w == -modetrade.PROBE_W)
 check("it files nothing outside a cheap run (why None)",
       _dec([_pa, _pb], maint_charging=True,
            ).why == "cycle" and modetrade.decide(
diff --git a/goodwe_controller/test_opt20.py b/goodwe_controller/test_opt20.py
index 889d8fd..39f0816 100644
--- a/goodwe_controller/test_opt20.py
+++ b/goodwe_controller/test_opt20.py
@@ -248,11 +248,14 @@ print("\n4. battery modes on, no probe: byte-identical to release/1.0 bf9019e")
 # now counts those seconds, so ch_ch's quarters land on 3450.0 W where they
 # landed 1.3-1.4 W over it (bf9019e: 15fc25dd...), and ch_ch_maint's first,
 # partial quarter charges a little less at its end (bf9019e: e46e3c66...).
+# MAINT-24 moved ch_ch_maint again: B no longer grid-charges beside A's
+# maintenance charge, and A's charge is no longer paused (release/1.0 02eac3b:
+# e56eddab...).
 AT_BASE = {
     "sf_ch": "422d6578a7decf1ae3749edd1898ff3cd0541d904c95f636cdd9b1de8c1a07c9",
     "ch_ch": "2b5879ec95810c39a5f0f82c04b9f8e358ea03ddce4ba187cc2b7e0885dfcbfa",
     "ch_ch_maint":
-        "e56eddabdb785f81793e7afa525f8e6da237b0b2165860aa8e0f8a6499b275a9",
+        "df86a451a3b2d365ca5d35b772cd1eb8502d164e6b63e6844b5cfb82f15aeb46",
 }
 _got = sc.no_probe_digests()
 for _k in AT_BASE:
@@ -260,8 +263,8 @@ for _k in AT_BASE:
           f"{_got[_k][:16]}")
 check("with no refusal every share, grid, trade sentence, role and plant "
       "power of a scripted cheap run equals bf9019e's (A Solar first, A "
-      "charging, A in maintenance charge; the last two as SAFETY-125 moved "
-      "them)", _got == AT_BASE)
+      "charging, A in maintenance charge; the last two as SAFETY-125 and "
+      "MAINT-24 moved them)", _got == AT_BASE)
 
 print()
 if fails: