diff --git a/frappy_psi/magfield.py b/frappy_psi/magfield.py
index 71f128b..eab0bd1 100644
--- a/frappy_psi/magfield.py
+++ b/frappy_psi/magfield.py
@@ -392,7 +392,7 @@ class Magfield(SimpleMagfield):
         if sm.init:
             self.init_progress(sm, self.current)
         if abs(self.current) > self.tolerance:
-            if self.get_progress(sm, self.value) > self.leads_ramp_tmo:
+            if self.get_progress(sm, self.current) > self.leads_ramp_tmo:
                 raise HardwareError('no progress')
             return Retry
         if sm.mode == Mode.DISABLED and abs(self.value) < self.tolerance:
diff --git a/frappy_psi/mercury.py b/frappy_psi/mercury.py
index bdb5227..8c88dfd 100644
--- a/frappy_psi/mercury.py
+++ b/frappy_psi/mercury.py
@@ -362,6 +362,7 @@ class TemperatureLoop(TemperatureSensor, ConvLoop):
     tolerance = Parameter(default=0.1)
     _last_setpoint_change = None
     __status = IDLE, ''
+    __ramping = False
     # overridden in subclass frappy_psi.triton.TemperatureLoop
     ENABLE = 'TEMP:LOOP:ENAB'
     ENABLE_RAMP = 'TEMP:LOOP:RENA'