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Alan_M · 9th February 2020, 11:35

I have been through the test procedure by earthing pin 3. Doing this the FBH fires up and runs for as long as the earth to pin 3 is maintained and will heat the coolant producing plenty of heat.
But in the cold mornings last week (around 0 degrees) it didn’t appear to be coming on. I stopped after about a mile or 2 to check and it definitely wasn’t working.
I’ve checked again by spraying temp sensor to bring the displayed temp on the dash down to -3 and again the FBH didn’t start when I started the engine which was cold.

I assume it’s not getting a signal to switch on, or could there be a fault within the FBH.

Any ideas what the problem might be and what I can I check/test to try and sort this please?

9th February 2020, 11:35	#1
Alan_M Regular poster Rover 75 Tourer + saloon Join Date: Apr 2019 Location: Newport Posts: 99 Thanks: 16 Thanked 27 Times in 21 Posts	FBH tests Ok but not working I have been through the test procedure by earthing pin 3. Doing this the FBH fires up and runs for as long as the earth to pin 3 is maintained and will heat the coolant producing plenty of heat. But in the cold mornings last week (around 0 degrees) it didn’t appear to be coming on. I stopped after about a mile or 2 to check and it definitely wasn’t working. I’ve checked again by spraying temp sensor to bring the displayed temp on the dash down to -3 and again the FBH didn’t start when I started the engine which was cold. I assume it’s not getting a signal to switch on, or could there be a fault within the FBH. Any ideas what the problem might be and what I can I check/test to try and sort this please?