It popped as soon as I switched it on, so I replaced it with another (3A) and that blew too. I phoned the emergency "help I've got no heating" number and the national grid just said "call out an engineer"...
2007-12-13 19:32:16 · 2 answers · asked by ~☆ Petit ♥ Chou ☆~ 7 in Home & Garden ➔ Maintenance & Repairs
The programmer is a Honeywell st699, which IS 3amp rated. The fuse as you will know is in the on off switch/isolator.
The last service was last christmas.
The programmer itself has been hesitant to recognise it has been switched on, a time or two. But when I put in a new fuse, 3amp, and switch on, momentarily the leds on the programmer light up ...... the nthe fuse pops.
2007-12-14 02:14:19 · update #1
Hello Petit Chou:
Fuses blow for two reasons: A short circuit bypassing the load, or drawing too much current. If you can trace out your circuit that the fuse protects, this should give you your reason for failure. If it blows immediatly, it is a short circuit. You may have a switch stuck in an on position, or a wire may have heated and fused to another wire.
2007-12-15 10:50:29 · answer #1 · answered by OrakTheBold 7 · 0⤊ 0⤋
MORE DETAILS PLEASE!
I am an engineer, but I'm not a physic (pun intended). Please provide brand name, model number, and installation date.
That which I require are the electrical specifications of your low voltage control circuit.
--Jim
2007-12-14 07:51:00 · answer #2 · answered by CousinJim 3 · 1⤊ 1⤋