Here is the patch attached that fixes that issue
diff -r 49f974c860fe lm_sensors-3.4.0/debian/fancontrol-systemd-pm
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/lm_sensors-3.4.0/debian/fancontrol-systemd-pm Tue Nov 13 17:11:58 2018 +0100
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+PATH=/usr/sbin:/bin
+
+case "$1" in
+ post) systemctl restart fancontrol
+ exit 0
+ ;;
+ *) exit 1
+ ;;
+esac
+
diff -r 49f974c860fe lm_sensors-3.4.0/debian/rules
--- a/lm_sensors-3.4.0/debian/rules Tue Nov 13 17:10:50 2018 +0100
+++ b/lm_sensors-3.4.0/debian/rules Tue Nov 13 17:11:58 2018 +0100
@@ -24,6 +24,8 @@
override_dh_auto_install-indep:
$(MAKE) install-prog-pwm $(MAKEARGS_INDP)
+ mkdir -p $(CURDIR)/debian/fancontrol/lib/systemd/system-sleep/
+ cp $(CURDIR)/debian/fancontrol-systemd-pm $(CURDIR)/debian/fancontrol/lib/systemd/system-sleep/fancontrol
override_dh_installinit-indep:
dh_installinit -pfancontrol --restart-after-upgrade
