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I service a number HRM Wallstar boilers and live on a small estate built some 6 years ago where all of the properties had HRM 12/14's installed. I moved in about a year ago and have had no problem with mine but know of at least 4 others that suffer from regular burner lockouts that don't seem to be attributable to any single factor other than a build up of air in the supply line which can be seen in the flexi oil hose between non-return valve and pump.
My own also shows a large slug of air but has never causes the burner to go to lockout. All the other problem burners will fire as soon as reset and continue for weeks before gong to L/O again. If I vent the supply line at the pump and remove all air this does seem to increase the length of time before a repeat L/O occurs.
In one I have replaced the non-return valve with a new HRM supplied product which now incorperates the solder wheel fire valve in the same component as the N/R valve but this has not resolved the problem.
My question to all those oil experts out there is have you experienced a similar phenomenon? And of course if so, and you cured it, what did you find was the cause?
I am leaning toward a problem with the Danfoss pump but these are generally very reliable. Maybe it's just because the oil needs lifting a bit. In all cases the tank outlet is no more than 1.75 meters to the pump though and HRM assure this is fine.
I have contacted HRM who seem oblivious to any issues, though the redesign of the non-return valve did make me wonder.
A great design with a great burner and very good technical support (present issue accepted) makes me think this is just me. If someone else has experienced this I would love to hear from you cause i'm losing my marbles.
A tigerloop sounds like it may cure the symptoms and I often see these fitted to wall mounted boilers but never an HRM. Camrays and Worcesters maybe but not the otherwise flawless HRM.
Heres hoping.
My own also shows a large slug of air but has never causes the burner to go to lockout. All the other problem burners will fire as soon as reset and continue for weeks before gong to L/O again. If I vent the supply line at the pump and remove all air this does seem to increase the length of time before a repeat L/O occurs.
In one I have replaced the non-return valve with a new HRM supplied product which now incorperates the solder wheel fire valve in the same component as the N/R valve but this has not resolved the problem.
My question to all those oil experts out there is have you experienced a similar phenomenon? And of course if so, and you cured it, what did you find was the cause?
I am leaning toward a problem with the Danfoss pump but these are generally very reliable. Maybe it's just because the oil needs lifting a bit. In all cases the tank outlet is no more than 1.75 meters to the pump though and HRM assure this is fine.
I have contacted HRM who seem oblivious to any issues, though the redesign of the non-return valve did make me wonder.
A great design with a great burner and very good technical support (present issue accepted) makes me think this is just me. If someone else has experienced this I would love to hear from you cause i'm losing my marbles.
A tigerloop sounds like it may cure the symptoms and I often see these fitted to wall mounted boilers but never an HRM. Camrays and Worcesters maybe but not the otherwise flawless HRM.
Heres hoping.