Ideal Exalt E98 — Cascade Bus Error
E98
Cascade Bus Error. Communication with other boilers has been lost. The table classifies it as Blocking (Auto Reset).
Applies to
This communication or network fault code is displayed by the CTRLMax control (E-code lockout display) on Exalt models (wall-hung IDEX110S/IDEX155S/IDEX199S and combis IDEX155C/IDEX199C, plus floor-standing IDEXFS110S/IDEXFS155S/IDEXFS199S and combis IDEXFS155C/IDEXFS199C), as documented in Ideal Exalt Wall & Floor User's Information Manual, doc 241581-5 (v6 WEB), Section 5.10.2 Manual Reset Lockouts and 5.10.3 Automatic Reset Blocking Lockouts (241581-5). Codes can differ between controller generations, so always check the manual that matches your unit.
- Ideal Heating Exalt Wall (heat-only)
- Ideal Heating Exalt Wall Combi
- Ideal Heating Exalt Floor (heat-only)
- Ideal Heating Exalt Floor Combi
- Ideal Exalt Wall 110
- Ideal Exalt Wall 155
- Ideal Exalt Wall 199
- Ideal Exalt Wall Combi 155
- Ideal Exalt Wall Combi 199
- Ideal Exalt Floor 110
- Ideal Exalt Floor 155
- Ideal Exalt Floor 199
- Ideal Exalt Floor Combi 155
- Ideal Exalt Floor Combi 199
Controller: CTRLMax control (E-code lockout display). Source manual: 241581-5.
Why a code is not a diagnosis
A communication code involves the link between controls (cascade, remote, sensors on a bus). Another unit being off, a wiring fault or an address conflict can all produce it.
Safe things to observe
- Check that every appliance in a multi-unit plant has power.
- Report the code together with any other codes on the system.
Do not
- Do not re-address or rewire control networks yourself.
How professional service helps
- A technician verifies power, wiring and settings across the connected units.
- Combustion and safety devices are verified with an analyser and the manufacturer's procedure after any repair.
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Frequently asked questions
Can I clear this code myself?
Clearing a code without fixing its cause usually just brings it back. Note the code, check the safe items on this page, then call a licensed technician. If your appliance manual describes a user reset for this exact code and it stays away, no call may be needed.
Boiler locked out? Call with the alert text ready.
The brand, model and this alert are passed along when you request service online, so the technician arrives prepared.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Ideal Exalt Wall & Floor User's Information Manual, doc 241581-5 (v6 WEB), Section 5.10.2 Manual Reset Lockouts and 5.10.3 Automatic Reset Blocking Lockouts · 241581-5 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.