st9420c1008
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Replaced Horstman 527 with Honeywell ST9400c and Hot Water will not fire
Good morning everyone, Looking for some pointers. As the title says we replaced the old broken one with a new ST9400C. Transferring the wiring didn't seem too bad at all. I have attached a pic of the old wiring. Basically one wire for CH, one for HW and the loop from Live to 2 and 5 for...- btolsta
- Thread
- hot water issues oil boiler programmer st9420c1008
- Replies: 8
- Forum: Plumbing and Central Heating
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Replacing a UP2 controller unit
Hi, I have just moved home and the new house has a Worcester 30 CDi boiler with a UP2 dual controller. I know it is an upgrade, from my last house, but it feels like a bit of a downgrade. In the old house we had a Worcester 28 CDi and a Honeywell CM927 wireless room stat/programmer. I believe...- amccaig
- Thread
- cm927 honeywell rf2 st9420c1008 up2
- Replies: 8
- Forum: Plumbing and Central Heating