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Deleted member 113501
HELP!,,,, E125 error code
Been trying to get to the bottom of problem with potterton titanium 40.
keep getting e125 which is circulation fault ( primary circuit). Fault is intermittent.
Thought about system flush but seem am reluctant as
all rads are red hot. Return pipe also hot.
Fault generally becomes noticeable when hot water is drawn off and then just runs cold.
May also happen when just on heating mode but not sure if this is triggered by water being drawn off while the heating is on, that locks up
again giving E125. can usually get it to reset ok but usually goes again same day.
sometimes can go a week or more without problem
have done the following with no success:
Back In December drained system down. (water was a bit black but no sludge) , ran system cleaner for few hours.
then drained off. Flushed. fit inhibitor and refilled. Next day got e125 but was then ok for about 8 weeks. Rads still all getting hot enough
Renewed C H temp sensor and safety thermostat.
Pump appeared to be a bit ‘sticky’ so fitted new one
Removed and cleaned 3 way valve and fitted new diverted valve ( didn’t really need cleaning)
Removed and checked flow pipe from burner to 3 way diverted valve. Was clean.
Removed and flushed plate heat exchange ( was clean anyway! Great flow on DHW side and primary circuit when using hose pipe on it)
As fault appears intermittent also ran it with a new pcb. Still got same e125 code so refitted original.
Back to square one!,
any pointers will be appreciated.
Been trying to get to the bottom of problem with potterton titanium 40.
keep getting e125 which is circulation fault ( primary circuit). Fault is intermittent.
Thought about system flush but seem am reluctant as
all rads are red hot. Return pipe also hot.
Fault generally becomes noticeable when hot water is drawn off and then just runs cold.
May also happen when just on heating mode but not sure if this is triggered by water being drawn off while the heating is on, that locks up
again giving E125. can usually get it to reset ok but usually goes again same day.
sometimes can go a week or more without problem
have done the following with no success:
Back In December drained system down. (water was a bit black but no sludge) , ran system cleaner for few hours.
then drained off. Flushed. fit inhibitor and refilled. Next day got e125 but was then ok for about 8 weeks. Rads still all getting hot enough
Renewed C H temp sensor and safety thermostat.
Pump appeared to be a bit ‘sticky’ so fitted new one
Removed and cleaned 3 way valve and fitted new diverted valve ( didn’t really need cleaning)
Removed and checked flow pipe from burner to 3 way diverted valve. Was clean.
Removed and flushed plate heat exchange ( was clean anyway! Great flow on DHW side and primary circuit when using hose pipe on it)
As fault appears intermittent also ran it with a new pcb. Still got same e125 code so refitted original.
Back to square one!,
any pointers will be appreciated.